Among these I should place, first, the broadly tolerant attitude that has been a characteristic of this country. I use the word in its most inclusive sense, to cover tolerance of religious opinion, tolerance in politics, tolerance in social relationships; in general, the liberal attitude of every citizen toward his fellows. It is this factor which has preserved to all of us that equality of opportunity which enables every American to become the architect of whatever fortune he deserves.
The Genius of America (1924)