America was the freest society on earth for generations; perhaps more than a century. People from throughout the world fled tyranny for American shores.
During the past couple generations, however, the U.S. government has steadily increased controls, regulations and taxes.
For the past 3 years, record numbers of American citizens have left or have renounced U.S citizenship.
In fact, each of the past 3 years has set a record for the number of Americans renouncing citizenship. And last year (2015), another record was set: 4,279 Americans renounced citizenship. See here.