When world war i was beginning in europe, the united states was trading profitably with

Great Britain

Explanation:

At the beginning of the Great War, the United States were trading with Great Britain.  Eventually the United States said that they wouldn't help any belligerent in the war, but still somewhat discreetly traded with Great Britain and gave them weapons.  It wasn't until I believe the Zimmerman Telegram that was supposedly sent from Germany to Mexico where Germany was asking Mexico to go to war with the United States to reclaim their lost land and stall any United States advance into Europe, that the United States got involved in the war.  The Zimmerman Telegram is a widely disputed issue in the realm of WW1.  As for your original question though, I believe the correct answer is they were trading profitably with Great Britain.  Hope this helped!

-Kirito

Triple Entente (Russia, France and Britain) and also the Triple Alliance (Austria-Hungary, Italy and Germany). Hope this helps!!

:3

pretty sure they split up because of religious conflicts.

the protestant reformation's started in 1517, disturbing the religious and political order in europe´s catholic countries. the outcome was the european wars of religion prosecuted in europe in the 16th, 17th and part of the 18th century. nonetheless, uprisings, territorial disputes, and great power conflicts were also causes of the wars.