This is a quote from Ronald Reagan On Immigration:

“I received a letter just before I left office from a man. I don’t know why he chose to write it, but I’m glad he did. He wrote that you can go to live in France, but you can’t become a Frenchman. You can go to live in Germany or Italy, but you can’t become a German, an Italian. He went through Turkey, Greece, Japan and other countries. But he said anyone, from any corner of the world, can come to live in the United States and become an American.