No planet is more earth-like than Earth itself, so if life really does pop up readily in earth-like conditions, then surely it should have arisen many times right here on our home planet? And how do we know it didn't? The truth is, nobody has looked.
I was quite ready to accept certain restrictions on the United States. After all, there was a great dollar shortage. It was quite clear that the more prosperous Europe became, the more business there would be in the United States.