Lend-Lease Act: A policy enacted during WWII that allowed the U.S. government to lend or lease military equipment to other countries for their defense.
Cash-and-carry policy: A provision under the Neutrality Act allowing belligerent nations in WWII (except those deemed "aggressors") to purchase non-military goods from the U.S., but required them to pay cash upfront and provide their own transport.
Embargo Act: A law passed in 1807 during the Napoleonic Wars that prohibited American ships from trading with foreign nations in an attempt to remain neutral.