Answer: False
Explanation: the historian Frederick Jackson Turner gave a lecture in 1893 which was later published the same year. The title of the lecture was "The Significance of the Frontier in American History."
In the lecture, he attributed several successes and defining characters of American history to the frontier. This includes intellectual achievements, the spread of missionary activity, the growth of democracy and the independence of industries in America.
The lecture was therefore one that praised the frontier and not one that saw it as a destabilizing or chaotic force.