The document discusses the reasons for America entering World War I and World War II. For WWI, the main reason was the sinking of the passenger ship Lusitania by a German U-boat in 1915, which killed over 100 American citizens and helped turn public opinion against Germany. For WWII, America initially aided Britain and France through Lend-Lease but officially entered the war after the Japanese attack on Pearl Harbor in 1941. Both events involved the deaths of American citizens and forced America's hand into joining the wars.