Why did many americans see manifest destiny as the nation’s right?

They believed that the American people had been elected by God to command the world.

Explanation:

The Manifest Destiny doctrine is a philosophy that emerged during the 1840s and was widely disseminated and used until the mid-1880s. Created by the United States, the Manifest Destiny doctrine expressed the belief of the American people that it had been elected by God to rule the world.

Thus, American geopolitical expansionism would be nothing more than an expression of the fulfillment of divine will. Those who advocated Manifest Destiny believed that the peoples of America could not be colonized by European countries, but that they should govern themselves.

when he becomes king