FDR's Foreign Policies
The Neutrality Acts were passed on four separate occasions. The first being passed on August 31, 1935 embargoed the exportation of trading or selling arms to countries at war. This act also warned civilians traveling by boat, likely caused by the unrestricted submarine warfare of WW1. The second Neutrality Act was passed in February of 1936 and simply renewed the first Neutrality Act for another fourteen months. The third Neutrality Act was passed in May of 1937 also extended the reign of the first Neutrality Act, but this time did not have an expiration date. This also added the section that abolished trade with countries in "civil war", such as Spain. The "cash and carry" method was implemented also; this allowed the President to permit the sell of supplies to countries at war as long as they paid for shipping and paid for the materials in cash. In 1939, the last of the Neutrality Acts was passed, shortly after Germany invades Poland. This implemented the allowance to sell to countries at war with the same parameters regarding the "cash and carry" method.
Lend-Lease Act of 1941
The Lend-lease Act of 1941 gave support to the Allied forces from the US. In total, 50.1 billion was given out to the various Allies, such as Britain, France, The USSR, and China, with the expectation that the equipment or materials were to be either given back, or paid for at the end of the war. Not much was given back, and after the war, most of those countries could not afford to pay back for the equipment, so the US ended up in roughly the same place that it did after WW1.