Is the United States exceptional? Of course we are! Two hundred years ago we were one of the poorest countries in the world. We accounted for less than 1% of the world's total GDP. Today our GDP is 23% of the world's total and more than twice as large as the No. 2 country's, China.

America became the wealthiest country because for most of our history we have followed the basic principles of economic freedom: property rights, freedom to trade internationally, minimal governmental regulation of business, sound money, relatively...