• Causes of US Involvement in World War II

    Following World War I, the United States adopted an isolationist stance. Starting in 1935, 
    Congress even passed various neutrality acts to enforce the will against foreign 
    entanglement. But by December of 1941, President Roosevelt’s formal declaration of war 
    made this legislation irrelevant. 

    Although America attempted isolationism, European and Asian affairs brought global 
    tension that eventually hit the country’s traditional allies. An aim of World War I had 
    been “to make the world safe for democracy”, but democracy in the 1930s was 
    increasingly endangered. The roots of World War II lay in the totalitarian leaders of Asia 
    and Europe and their agendas for expansion. 

    Totalitarianism emerged in the Soviet Union, Italy, Spain, and Germany. The fascist 
    leaders had expansionist goals and soon crushed neighboring societies. Italy invaded 
    Ethiopia and established Italian East Africa. Meanwhile, Japan invaded Manchuria, 
    seized Chinese land, and occupied French possessions in Southeast Asia.

    In 1938 Europe, the war officially began when Germany’s Adolf Hitler invaded Austria 
    and took Czechoslovakia’s Sudetenland, which was home to 3.5 million ethnic Germans. 
    Hitler claimed he was only “restoring rightful boundaries”, since Germany had lost 
    territory in World War I. But Hitler had ideas of widespread domination. In 1939 he and 
    Mussolini created the Rome-Berlin Axis alliance, a military agreement designed to last 
    ten years. Japan entered the pact later that year. Hitler had the confidence to invade 
    Poland in 1939. Poland’s allies, England and France, therefore declared war on Germany. 
    America’s traditional allies were at war.

    Initially, President Franklin Roosevelt limited his aid to arms sales, which were restricted 
    in a neutrality act. But Hitler’s invasions continued. He took Denmark, Norway, and 
    Holland, and the Belgian king surrendered his army shortly thereafter. And in June of 
    1940, France succumbed to Nazi forces. The Axis alliance now dominated Europe from 
    the North Cape of Africa to the Pyrenees. Great Britain’s Winston Churchill vowed to 
    continue the battle for democracy.

    Churchill soon needed military aid, and Roosevelt declared that the United States must 
    become “the great arsenal of democracy”. By 1941, he officially ended the country’s 
    isolationist stance by passing the Lend Lease Act, which lifted restrictions on supporting 
    foreign troops with defense gear; the Act first appropriated $7 billion to lend or lease 
    supplies to any countries the president designated. President Roosevelt also started to call 
    US National Guard members to war training.

    Next, the Americans built a base in Greenland. Then, stationed aboard warships near 
    Newfoundland, Roosevelt and Churchill issued the Atlantic Charter in June of 1941. 
    Although the US had not officially entered the war, the Atlantic Charter presented the 
    two countries’ goals for a war against fascism. It included their disinterest in acquiring 
    new territories through the war. Shortly thereafter, the US became involved in the years-
    long Battle of the Atlantic.
    The United States officially entered World War II in December of 1941. Japanese 
    military leaders, led by Admiral Isoroku Yamamoto, attacked a US naval base in Pearl 
    Harbor, Hawaii. The Japanese aimed to destroy the US fleet docked in the Pacific, thus 
    leaving the Japanese free to pursue oil mines in the region. A series of aerial attacks by 
    361 airplanes succeeded in compromising eight important warships. The air attacks also 
    killed more than 2,300 people. The following day, President Roosevelt asked Congress 
    for a declaration of war against Japan. Congress obliged. By the time of this official 
    declaration, there were battles to fight on many fronts, but “Remember Pearl Harbor!” 
    became a rally cry for the war. 


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