Why did the united states become involved in world war 1?

The U.s tried to remain neutral however, little things the opposing sides did began to change their stance. Britain propaganda, the sinking of ships by German U-boats, the final thing that pushed them over the edge was the "Zimmerman" note. A note that tried to get Mexico to declare war on the U.s.

it was on the rise and doing very well and would continue to do well until the great depression from 1929-1939