Several United States laws have been called Neutrality Acts:

• The Neutrality Act of 1935 prohibited American citizens from selling arms to belligerents in international war. It resulted from Italy's invasion of Ethiopia.
• The Neutrality Act of 1937 stated that United States citizens could not sell arms to belligerents in Civil Wars, including the government side. It resulted from the Spanish Civil War.
• Later in 1937, a second Neutrality Act forbade travel by U.S. citizens on ships of belligerents. This was aimed at the Sino-Japanese War (1937-1945).

There were also the Neutrality Acts of 1939, which provided that henceforth European democracies could buy American war materials but only on a "cash and carry" basis