Americans were against US involvement in the war, and did not want the United States to get tangled up in European affairs after 1919.
Imperialism was basically the tension over colonies. This was a widely recognized reason for starting off WWI. Colonies were places that were taken in to control by other ruling countries. This made countries more powerful and <span>dominant, so this is linked to alliances that were made back then.</span>
They used supply and demand and traded very many things
