By articulating the end of the American frontier and calling for new frontier abroad, Turner laid the intellectual groundwork for a new kind of U.S. foreign policy—one that led the United Stated ...

But you then have to couple that with the other insight, which is that people at the end of the nineteenth century believed that he was right, believed that the frontier thesis was correct.

Spirit Airlines Inc. shares fell more than 60% in the after-hours session Tuesday after the Wall Street Journal reported it ...