Question

which of the factors (more than 1) will cause the u.s. to abandon isolationism and enter WW1, you must provide evidence and explain

Answer 1

I don't see any options at the moment, but two potential factors would have been: The Lusitania sank, that was a big one because American citizens died when that occurred, and the Zimmerman telegram, which attempted to get Mexico on the side of the Central Powers.

Answer 2

The second of which got America involved in the war because it was asking Mexico to attack the US in the name of the Central Powers.