The Columbian Exchange was when the old world (Europe) trade with the new world (America) items. for example: Old World had horses. So if Europe never came to America... we wouldn't have them. Or new world had tomatoes. If Europe didn't have tomatoes... We wouldn't have pizza or delicious Italian goods.
George Washington ........ he was the first president
He insisted that his people make peace with the native people. This way they could avoid conflict.