Why did the United States abandon its historic isolationism and turn outward to develop imperial power ambitions at the end of the nineteenth century?

At the end of the nineteenth century, the United States had become the greatest industrial power in the world.

Explanation:

The cities of the Northeast and the Great Lakes were industrial powerhouses that supplied the country and the world with manufactured goods. This brought more wealth not only to individual citizens, but also to the government.

The government was more powerful, and it could project power outside its borders. In particular, the United States was interested in keeping Latin Amerca under control.

This is why the country engaged in a war against Spain, resulting victorious and obtaining Cuba and Puerto Rico, and this is also why it helped Panama gain independence from Colombia, and built the Panama Canal to allow for a faster trade between the Pacific Ocean and the Caribbean Sea.

cuban communists pressured the soviet union to place missiles in cuba.