The United States claimed the Lusitania carried an innocent cargo, and therefore the torpedoing was a monstrous German atrocity. Actually, the Lusitania was heavily armed: it carried 1,248 cases of 3 inch shells, 4,927 boxes of cartridges (1,000 rounds in each box), and 2,000 more cases of small arms ammunition. The British and American governments lied about the cargo.
I think the most significant cause of World War one was the assassination of the Archduke Franz Ferdinand. The other causes of the war was Imperliasm, Militarism, Nationalism and Alliances that were formed.
Some of the arguments used to support US expansion and manifest destiny were: European examples, new markets and access to vast natural resources. Because of the US massive industrial expansion and production, US industries needed new markets to sell their goods to and they need access to more natural resources to ensure the continued production. The US expanded its inluences into Alaska, the Pacific (Hawaii, Samoa, Guam, and the Philippines), Latin America and Asia (China and Japan)
The now U.S. was controled by the English.
A. Many people became hobos