In the 1800s, then notion of manifest encouraged americans to think of the united states as the land betweeen what

In the 1800s, the notion of Manifest Destiny encouraged Americans to think of the United States as the land between the Atlantic and the Pacific oceans.

Explanation:

The notion of Manifest Destiny refers to the political and social movement that advocated imperialism in the United States in the second half of the 19th century.  

The movement finds its origin in the Democratic Party but was later boarded by the Republican Party. They believed that fate had set the United States to grow into a great power that could compete with the European empires, controlling the North American continent in its both shores, from the Atlantic to the Pacific. The belief in the superiority of the Anglo-Saxon race led to a "civilization offensive" overseas and was an argument for American imperialism, which gained in influence in the late 19th century.

Manifest Destiny has contributed to the outbreak of the Mexican-American War, the Spanish-American war and the Indian Removal. Supporters, for example, thought that imperialism was lawful, because otherwise someone else would do it.