When did the US enter WWI? What was the significance of the entry of the US into the war?

In early April 1917, with the toll in sunken U.S. merchant ships and civilian casualties rising, Wilson asked Congress for “a war to end all wars” that would “make the world safe for democracy.” A hundred years ago, on April 6, 1917, Congress thus voted to declare war on Germany, joining the bloody battle—then
I hope this Helps

Ithink its trade and commernce let me know if im wrong

It me to understand the world and my place in it. for example, (and i know i’m using the terminology ‘historical perspective’ loosely here; some of my examples may be better termed an ‘evolutionary perspective’) knowing that all humans can trace their ancestry back to a common ancestor who lived in southern ethiopia ~200,000 years ago makes me feel connected to everyone on the planet. knowing that some of our ancestors left africa about 70,000 years ago and interbred with more archaic hominin species in europe and elsewhere, me to see the stupidity of white supremacist ‘purity of the race’ themes. seeing how religion was used to enslave people, and how callously lives were thrown away by those in power in the world wars of the past century makes me feel extremely fortunate to be living in the modern era. and, perhaps most importantly is that this knowledge makes me for the sacrifices our ancestors made to get us to this point, and determined to do my part to make the world a better place for the next generation.