it was our business because 1) German subs started sinking our ships - until then we were just providing munitions and supplies; and 2) Germany was actively encouraging Mexico to join the Central Powers and declare war on the US (they tried the same in ww2)
Maybe if Britain wasn’t trying to starve out Germany with their naval blockade, the Germans wouldn’t have had to sink ships heading to Britain.
A true Neutral would have told Britain to stop the blockade or else we wouldn’t risk our ships trying to aid them.
And furthermore, Britain should have stayed out of it as well. It basically doomed their Empire win or lose.