It was called Manifest Destiny.
The doctrine was supported by the success of the colonies along the Atlantic coast, and the subsequent expansion into the Louisiana Purchase and Texas. In the process, the US entered lands occupied by several Native American tribes, or by small numbers of settlers in lands only nominally claimed by Mexico or British Canada.
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The belief that the right to all the land from the Atlantic to the Pacific belonged to Americans is called manifest destiny. Manifest destiny was not a specific policy, but a general notion.
They found the "Northwest Passage"; a trail going from the Atlantic to the Pacific.
This was called Manifest Destiny.manifest destinyThis belief was called "manifest destiny." Americans believed that it was their right, and America's inevitable future, to overtake all of North America.
The First Continental Congress originally called for peace. When peace was not possible a declaration of war was issued and a declaration of independence.
John Dickinson, a Founding Father, called for a resolution in the Second Continental Congress for Independence from Britain.