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The Neutrality Act of 1935 prohibited American citizens from selling arms to belligerants in international war. It resulted from Italy's invasion of Ethiopia.
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The Neutrality Act of 1937 stated that United States citizens could not sell arms to belligerants in Civil Wars, including the government side. It resulted from the Spanish Civil War.
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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).