Why did Hitler enter World War 2?

Hitler wanted to acquire living space for his so-called Aryan race. Despite popular belief, he did not want to conquer the world or Europe for that matter. He wanted to conquer Austria, Czechoslovakia, Poland and Russia. He successfully annexed Austria and Czechoslovakia without war. He knew that the wouldn't just give him Poland so he decided to invade it in 1939 cause Britain and France to declare war on Germany. That's how World War 2 started.