they were not all completely kicked out
They didn't leave entirely! See, they went away after the American Revolution to lick their wounds and wonder how we beat them. Some went to Canada and some left with the army, but they retreated. And then they came back! They came back for the War of 1812! So no, they weren't completely kicked out.
But, as your teacher might see it, they left! They went! There were no British in America after our Revolution!
Soooooo...it's really up to you how you take it! Both are entirely correct!