Answer 1: Although constrained by powerful isolationist sentiment in the United States, President Roosevelt was determined to help democratic Great Britain continue the war against Nazi Germany. Even as he promised to keep the United States neutral in the European war, Roosevelt ordered the expansion of military construction and pledged--as shown in this footage--that the United States would serve as the "great arsenal of democracy." In March 1941, Congress approved Lend-Lease aid for Britain. Britain ultimately received over 31 billion dollars in military aid from the United states. The United States finally entered World War II after the Japanese surprise attack on Pearl Harbor on December 7, 1941.
Answer 2: The effect was Roosevelt soon took advantage of his authority under the new law, ordering large quantities of U.S. food and war materials to be shipped to Britain from U.S. ports through the new Office of Lend-Lease Administration. The supplies dispersed under the Lend-Lease Act ranged from tanks, aircraft, ships, weapons and road building supplies to clothing, chemicals and food.
Historians often rely on both primary and secondary sources when supporting an argument, since it's important to use secondary sources to put the argument in context, and primary sources in order to make an original point.
