The Neutrality Act of 1939 allowed nations at war to buy arms and other supplies from the United States as long as those nations agreed to keep the United States out of the conflict promised not to use the materials against the United States paid cash and transported the materials themselves adopted democratic policies in their own countries

## Step 1<br />The Neutrality Act of 1939 was a significant piece of legislation passed by the United States Congress in response to the growing tensions in Europe and Asia that eventually led to World War II. The primary goal of this act was to avoid entanglement in foreign conflicts, which was a common sentiment among the American public and policymakers at the time.<br /><br />## Step 2<br />The act allowed nations at war to buy arms and other supplies from the United States under certain conditions. The key condition was that the purchasing nations had to pay cash for the materials and transport them using their own ships. This was to ensure that the U.S. would not be involved in the transportation of these materials, which could potentially lead to direct involvement in the conflict.<br /><br />## Step 3<br />The other options provided in the question, such as nations agreeing to keep the U.S. out of the conflict, promising not to use the materials against the U.S., or adopting democratic policies in their own countries, were not the primary conditions set by the Neutrality Act of 1939.