Skip to Main Content

Foreign Policy in the 1930s: From Neutrality to Involvement

Written by: John E. Moser, Ashland University


By the end of this section, you will:

  • Explain the similarities and differences in attitudes about the nation’s proper role in the world

Suggested Sequencing

Use this narrative to discuss the United States’ isolationist approach to foreign policy during the interwar period.


As the country remained mired in the Great Depression in the early to mid-1930s, it began to appear ever more likely that the world was headed for another major war. Japan conquered Manchuria in 1931 and invaded China in 1937. In Europe, Benito Mussolini’s fascist regime in Italy had launched an invasion of Ethiopia in 1935, and Adolf Hitler, who had taken power in Berlin in 1933, engaged in flagrant violations of the Treaty of Versailles.

In this increasingly dangerous environment, Americans became convinced that their involvement in World War I had been a grave mistake – one that must not be repeated. The best-selling book Merchants of Death, published in 1934, made the provocative claim that U.S. banks and corporations had actively plotted to draw the country into war in 1917 for war profiteering. A Senate subcommittee chaired by Senator Gerald P. Nye of North Dakota soon began an investigation into the book’s charges, and although the Nye Committee found no direct evidence of a conspiracy to embroil the United States in the conflict, it did reveal that U.S. firms had made massive amounts of money from the country’s involvement. In a time when “big business” was being blamed for the Great Depression, this was enough to convince Americans that business was guilty and that something had to be done to prevent the banks from leading the country into war again.

As a direct result of the Nye Committee’s hearings, Congress passed a series of laws – in 1935, 1936, and 1937 – collectively referred to as the Neutrality Acts. Taken together, these laws authorized the president to issue a declaration, when war broke out anywhere in the world, making it illegal to lend money or sell arms and ammunition to any country involved in the conflict. Other items could be sold to belligerent countries, but only if those countries paid cash for them and transported them in their own ships, a provision commonly referred to as “cash and carry.” Finally, Americans were prohibited from traveling on ships belonging to countries at war. In other words, the Neutrality Acts sought to identify the factors that had allegedly drawn the United States into World War I, and then to ban them.

The Neutrality Acts were invoked on several occasions in the 1930s and remained in effect in September 1939, when Great Britain and France declared war on Germany over Hitler’s invasion of Poland – thus marking the beginning of World War II in Europe. President Franklin Roosevelt took to the airwaves to assure the American people that the United States would stay out, but given the circumstances under which the war began, he recognized that most Americans naturally sympathized with Britain and France. “Even a neutral has a right to take account of facts,” he told his listeners. “Even a neutral cannot be asked to close his mind or his conscience” (Figure 12.29).

Franklin Roosevelt, pictured giving a radio speech, declared the United States would remain neutral in the war in Europe.
Franklin Roosevelt sits behind multiple microphones.

Within days of the outbreak of the war, Roosevelt asked Congress to remove the arms embargo provisions from the Neutrality Acts. There was no reason, the president claimed, why weapons and ammunition could not be sold on a cash-and-carry basis, just like other exports. This set the stage for the first in a series of legislative battles against those whom Roosevelt called “isolationists.” These senators and representatives, as well as their supporters, insisted that tampering with the Neutrality Acts was the first step toward actual involvement in the war. Ending the arms embargo, they argued, was a backhanded way of aiding Britain and France. After all, the powerful British Navy already prevented Germany from importing anything from the United States, and critics thus charged that the change would benefit only the Allies. Nevertheless, American sympathy for the British and French was such that both houses of Congress voted by substantial majorities to change the neutrality laws.

The European war took an ominous turn in spring 1940 when German forces shocked the world by overrunning France in a six-week military campaign. Suddenly, Great Britain was standing alone against Germany and Italy. That summer, Americans listened anxiously to radio reports of German bombers pummeling British cities and German submarines sinking British merchant vessels. Roosevelt provided some assistance, transferring 50 obsolete U.S. destroyers to the Royal Navy in exchange for 99-year leases on British bases in the Western Hemisphere, but by the end of 1940, Britain’s prime minister, Winston Churchill, had alerted the president to a new problem. The United Kingdom was running out of cash with which to purchase U.S. arms and other goods. Unless the situation changed quickly, the British would be cut off from their most important source of war materials.

The Roosevelt administration’s answer to this dilemma was a legislative proposal called Lend-Lease. It would give the president the power to transfer weapons, ammunition, and any other war materials to any country whose defense he deemed vital to the national security of the United States. The materials would then be returned after the war or be replaced if they had been damaged or destroyed. Roosevelt warned that if Germany defeated Great Britain, the United States would be Hitler’s next target. He compared his proposal to lending a garden hose to a neighbor whose house was on fire; doing so only made sense, because if the fire went unchecked it could easily spread to the lender’s own home.

The fight over Lend-Lease was one of the most significant debates on a matter of foreign policy in U.S. history. The plan was opposed by a wide variety of isolationist organizations, most notably the America First Committee, a group that boasted more than 800,000 members in 450 chapters scattered around the country. America First counted among its members many successful business owners, politicians, and celebrities, most notably the famous aviator Charles Lindbergh. Lindbergh and other speakers traveled around the country denouncing Lend-Lease. They told their audiences that Britain’s position might be unfortunate but providing aid to one side would bring the country much closer to involvement in a war that was none of America’s business (Figure 12.30). Roosevelt and his supporters denied this, countering that providing the British with the tools they needed to defeat Hitler’s Germany would ensure the United States would not have to become an active participant in the conflict. Ultimately, most Americans (and their representatives in Washington, DC) agreed with the president, and Congress approved the Lend-Lease Act in March 1941.

This America First Rally flyer advertised a gathering in St. Louis, Missouri, to urge the United States to stay out of World War II in Europe.

The flyer reads:

During the spring and summer, the debate over U.S. neutrality turned to events in the Atlantic. In an effort to protect British ships laden with Lend-Lease goods, Roosevelt began sending U.S. Navy vessels ever farther from shore. He was quick to refer to these missions as “patrols,” because under the neutrality laws it was illegal for U.S. warships to take part in British convoys. Isolationists objected, claiming that Roosevelt was intentionally sending ships into harm’s way in the hope of triggering an international incident that would bring America into the war. Their fears seemed confirmed when, in September 1941, a German submarine fired on the destroyer U.S.S.Greer. The president responded with an angry speech in which he called German U-boats “rattlesnakes of the Atlantic” and ordered Navy commanders to “shoot on sight” any such vessels they encountered. That autumn saw regular instances of hostile fire between U.S. ships and German submarines, although the two countries remained officially at peace with one another.

Because most Americans were paying attention to affairs in Europe in 1941, it came as a surprise that when the United States did enter the war, it did so by way of events in the Pacific. Since 1937, Japanese forces had been waging an undeclared war in China; in 1940, Tokyo concluded an alliance with Germany and Italy and began making threatening moves into Southeast Asia. The Roosevelt administration sought to deter Japanese aggression through economic sanctions, culminating in July 1941, when it effectively cut off all exports to Japan, including oil, to hamper the Japanese war machine. However, rather than curbing Japan’s desire to dominate East Asia, the sanctions inspired its military leaders to become even more aggressive.

On December 7, 1941, Japanese forces launched attacks against multiple targets in Southeast Asia and the islands in the Pacific. To prevent the U.S. Pacific Fleet from interfering, a task force of Japanese aircraft carriers had traveled quietly across the Pacific and sent its planes to make a surprise raid at dawn against the U.S. naval base at Pearl Harbor in Hawaii. By the time they finished, four U.S. battleships had been sunk, nearly 200 planes had been destroyed on the ground, and more than 2,400 U.S. service members had been killed (Figure 12.31).

An outraged President Roosevelt famously called December 7 “a date which will live in infamy” and asked Congress for a declaration of war against Japan, which was immediately made. Four days later, Hitler declared war on the United States. The America First Committee, recognizing that the country must now fully commit itself to war, dissolved within a few weeks.

A U.S. battleship sinks at Pearl Harbor after being attacked by Japanese carrier-based aircraft on December 7, 1941.

A ship is tilted halfway on its side. It is covered in smoke.


Review Questions

1. In the early to mid-1930s, examples of a world in growing international crisis included all the following except

  1. Japan’s conquest of Manchuria
  2. Italy’s invasion of Ethiopia
  3. Hitler’s Germany violating provisions of the Treaty of Versailles
  4. Japan’s attack on Pearl Harbor, Hawaii

2. As a result of the Nye Committee hearings, U.S. foreign policy during the mid-late 1930s can best be described as

  1. unofficial but active involvement in the League of Nations
  2. negotiation of collective-security agreements with nations threatened by totalitarianism
  3. passage of a series of neutrality acts to limit American exposure to rising world tensions
  4. complete isolation from growing world lawlessness

3. U.S. foreign policy during the interwar years was primarily motivated by a desire to

  1. keep the United States out of another armed conflict
  2. prevent the spread of totalitarian dictatorships into the Western Hemisphere
  3. remove Adolph Hitler from power
  4. counter the spread of Japanese imperialism in the Pacific

4. In an effort to aid the Allies despite isolationist sentiment in Congress at the start of World War II, President Franklin Roosevelt supported all the following except

  1. negotiating a destroyers-for-naval bases deal with Great Britain
  2. seeking to replace the “cash-carry” policy with “lend-lease”
  3. engaging in personal diplomacy with the leader of Great Britain
  4. sending American troops to reinforce British defenses

5. The Lend-Lease Act was a significant departure from most of American interwar foreign policy because it

  1. was supported by the America First Committee
  2. was drafted by members of the Nye Committee
  3. recognized the need for direct American support of the Allies
  4. came after Congress had declared war on Japan

6. Between September 1939 and the beginning of December 1941, President Roosevelt sought to help the Allies in all the following ways except

  1. revising the Neutrality Acts to permit the sale of arms and ammunition on a cash-and-carry basis
  2. lending war materials to countries whose survival was deemed vital to U.S. national security
  3. organizing American volunteer units to fight Germans in France
  4. sending U.S. naval vessels into the Atlantic on patrols to search for German submarines

7. The America First Committee’s most famous member was

  1. Franklin D. Roosevelt
  2. Charles Lindbergh
  3. Charlie Chaplin
  4. Gerald Nye

8. American neutrality in World War II officially ended with

  1. passage of the cash-and-carry modification to the neutrality acts
  2. patrols of the Atlantic by American warships in mid-1941
  3. Congress’s declaration of war after the Japanese attack on Pearl Harbor
  4. creation of the America First Committee

Free Response Questions

Compare the arguments for the United States maintaining neutrality during World War I with the arguments for maintaining neutrality during the 1930s.

Explain how and why Congress reacted to the growing threats of totalitarianism and fascism in Europe during the 1930s.

Explain why the passage of the Lend-Lease Act was so controversial.

AP Practice Questions

Men stack boxes of TNT that reach above their heads. The boxes are labeled
Figure12.32 Cases of TNT gunpowder shipped from the United States under the 1941 Lend-Lease Act were stacked in a tunnel dug out of solid rock 100 feet underground in western England.

Refer to the image provided.

1. The image provided most directly reflected a growing belief that
  1. the United States needed to abandon its post–World War I foreign policy of neutrality
  2. island hopping would win the European Theater of Operation
  3. appeasement would lead to an end to totalitarianism
  4. Japan was a greater military threat to the United States than Nazi Germany
2. The image was most directly influenced by the
  1. authorization of the Manhattan Project
  2. economic policies of the Great Depression
  3. rapid spread of communism in Eastern Europe
  4. advances of fascist regimes in Europe
3. Which group would most likely approve the policy depicted in the photograph?
  1. Supporters of Washington’s Proclamation of Neutrality
  2. Internationalists
  3. Opponents of the Treaty of Versailles
  4. Anti-imperialists
4. Which of the following developments represented a continuation of the sentiments illustrated in the photograph?
  1. Lyndon Johnson’s Great Society program
  2. Economic assistance to rebuild Western European countries after World War II
  3. Creation of the United Nations
  4. Recognition of the Cold War

Primary Sources

“‘Neutrality Act’ of 1937.” May 1, 1937. http://teachingamericanhistory.org/library/document/neutrality-act-of-1937/

Roosevelt, Franklin D. “Arsenal of Democracy.” December 29, 1940. http://www.americanrhetoric.com/speeches/fdrarsenalofdemocracy.html

Roosevelt, Franklin D. “December 8, 1941: Address to Congress Requesting a Declaration of War.” https://millercenter.org/the-presidency/presidential-speeches/december-8-1941-address-congress-requesting-declaration-war

Roosevelt, Franklin D. “Fireside Chat [on Neutrality].” September 3, 1939. http://www.presidency.ucsb.edu/ws/index.php?pid=15801

Roosevelt, Franklin D. “September 11, 1941: Fireside Chat 18: On the Greer Incident.” https://millercenter.org/the-presidency/presidential-speeches/september-11-1941-fireside-chat-18-greer-incident

“Transcript of Lend-Lease Act (1941.” https://www.ourdocuments.gov/doc.php?flash=false&doc=71&page=transcript

Suggested Resources

Dallek, Robert. Franklin D. Roosevelt and American Foreign Policy, 1932–1945, Second Edition. New York: Oxford University Press, 1995.

Doenecke, Justus D. Storm on the Horizon: The Challenge to American Intervention, 1939–1941. Lanham, MD: Rowman & Littlefield, 2000.

Hamby, Alonzo L. For the Survival of Democracy: Franklin Roosevelt and the World Crisis of the 1930s. New York: Free Press, 2007.

Moser, John E. The Global Great Depression and the Coming of World War II. New York: Routledge, 2015.

Utley, Jonathan G. Going to War with Japan, 1937–1941. New York: Fordham University Press, 2005.