How did Frederick j. Turner influence imperialism?

Frederick J. Turner influenced Imperialism through his "Frontier Thesis," which argued that the American frontier experience shaped national character and democracy. He posited that the closing of the frontier in the late 19th century created a sense of restlessness and a need for new territories, which contributed to the U.S. expansionist policies. This perspective encouraged imperialism as a means to seek new opportunities and resources, ultimately justifying American interventions in territories like Puerto Rico, Guam, and the Philippines. Turner's ideas framed imperialism as a continuation of American exceptionalism and destiny.