What manifest destiny actually was:

Imperialist phrase first used in 1845 to urge annexation of Texas; used thereafter to encourage American settlement of European colonial and Indian lands in the Great Plains and Far West; Created by John L. O'Sullivan; "overspread the continent allotted by Providence (God) for the free development of our yearly multiplying millions"

Explanation: Hope this helps :)

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the colonists were also expected to pay a tax to meet the costs of establishing and manning the borders of the proclamation line which led to the belief that the king had sided with the indians despite pontiac's rebellion, against the interests of the settlers. this contributed to the causes of the american revolution.