How did Americans get involved in the war

Answer: Several U. S. ships traveling to Britain were damaged or sunk by German mines, and in February 1915 Germany announced unrestricted warfare against all ships, neutral or otherwise, that entered the war zone around Britain ... With these attacks, public opinion in the United States began to turn irrevocably against Germany.

Now, up until just before the U. S. declared war on April 6th, 1917, the U. S. had desperately tried to stay neutral, but ties to Britain, propaganda, the sinking of ships by German U-boats, and a German attempt in the Zimmermann Note to get Mexico to declare war on the U. S. pushed the U. S. to getting involved.