Expansion has mostly been attached to the Manifest Destiny.
Step-by-step explanation:
Manifest destiny was indeed a commonly held belief in the States of America in the 19th decade that its natives were bound to widen throughout North America. The term "manifest destiny" is more often correlated with the expansionism of the USA from 1812 to 1860.
This period, from the war's 1812's end to the start of the American Revolution, was called the "era of manifest destiny." At such a moment, the United States extended Towards the Ocean —"from sea to shining sea"— mainly defining the boundaries of the navigable United States since they are now.