Answer:
Historian Frederick Jackson Turner believed that the strength and the vitality of the America identity lay in its land and vast frontier.
His thesis "The Significance of the Frontier in American History" mournfully proclaimed that the once vast American western frontier was closed. "American energy," Turner maintained, "will continually demand a wider field for its exercise."
Explanation:
In 1893, Turner spoke at the Chicago World's Columbian Exposition, where millions of Americans had flocked to Chicago for this 1893 multi-month event to experience displays of new technologies, new products, and new tastes. In the pavilions and halls of the Exposition, the electric light bulb, the moveable sidewalk, the Ferris wheel, diet carbonated soda, and Cream of Wheat were a few of the many exciting things unveiled.
Amidst the excitement, Frederick Jackson Turner offered his listeners at a American historians seminar, a new idea. His thesis "The Significance of the Frontier in American History" mournfully proclaimed that the once vast American western frontier was closed. "American energy," Turner maintained, "will continually demand a wider field for its exercise."
