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The U.S. sent the battleship Maine to protect American interests, which included sugar, but the Maine was blown up. This news pulled America into conflicts, starting the Spanish-American War.

A British passenger ship, the Lusitania, was carrying US citizens and Allies ammunition when it was sunk by the German submarines. The US remained neutral after this in line with the 1914 Proclamation of Neutrality. Later an American ship, the Sussex, is sunk and the US remains neutral because of German Sussex pledge.

The basis of a peace plan calling for open peace treaties, free trade, sea transportation, and arms reduction. It also recommended a general association of nations to preserve the peace. Americans are against this fearing future international entanglement.

AKA the Pact of Paris, a fifteen nation pact that held that all conflicts should be settled by peaceful means and that war was to be renounced. This pact lacked effectiveness because of its naivety.

A foreign policy doctrine adopted by FDR. US withdraws marines from Haiti, the Dominican Republic, and other areas. America stays out of Cuban Revolution, and US settles with Mexico on American properties in that country.

Required American exports of military components to be stalled for six months in the event of war.

A Hawaiian base for the American Pacific fleet where the Japanese sneak attacked. This pulls America out of isolationism and into the war.

The Manhattan Project produced an atomic bomb in 1945, and the US decides to use in on Japan for the sake of saving the lives of American soldiers. The first bomb is dropped by the Enola Gay on Hiroshima instantly killing 66,000 people and thousands more in the aftermath.