Do you think united states isolationism encourage or discouraged future acts of aggression by dictators?

Neither. Isolationism is the same as the friend that wants to stay out of an argument. However, US was secretly sending supplies to Britain during the first world war, and resulting in their ship being sunk. That is one reason they joined that war. In the second world war they played the isolation card and were forced to go to war after the occurrence of Pearl Harbor.

It is written in the constitution saying all beliefs are allowed in the u.s. justice will be surved to everyone no matter what the color of that person is. and that all people are equal not matter there color is the u.s. that was a lie though because black people were still treated poorly, and there were places that was white people only such as hospitals, schools, bathroom, and more.