The neutrality acts of 1937 and 1939 prohibited trading with any nation that was participating in a war. due to president roosevelt's efforts, however, the acts granted that a nation could trade with the u. s. if

they paid cash and used Non-American ships to transport the goods

Explanation:

Three laws were passed between 1935 and 1937 in the bid to prevent the U.S. from getting involved in European wars. These laws limited international trade with American citizens to countries who were not involved in any war. However, in 1939, President Roosevelt made these laws more flexible. American citizens could trade with belligerent countries if the countries paid cash and transported the goods on Non-American ships.