What event led the united states to enter world war i?

a german u-boat sank a british merchant ship, the lusitania, killing 124 americans.
the united states learning about the holocaust
germany's victory over france
after the allied powers unsuccessful attempt to storm normandy beach

Actually my guess is the assassination of Archduke Franz Ferdinand

Brainliest please?

the speech convinced americans that the ussr was an enemy, rather than an ally, which led to the creation of the truman doctrine.

unlimited governmental powers

explanation:

unlimited governmental powers was not a feature of the new state governments. state governments in the u.s. are structured in the same way as the federal government, with executive, legislative, and judicial branches.