The united states knew about the holocaust while it was happening in europe. what did it do to stop it? why did it continue to occur even though we knew it was happening?

The United States allowed immigration to help the victims avoid the Holocaust although not in the larger numbers that could have been more helpful. The United States entered the war in 1941 and also attacked Germany in retaliation. The Holocaust continued because the Nazis had a very well organized system of apprehension of people that were put in the camps. 

Slander.

What effect did the development of trade have on settlement patterns in medieval times