because the Idians kept moving out and following the buffalo
The Oregon territory was gained by the UNITED STATES of AMERICA from Britain. The Oregon territory was fairly large, which enabled the US to gain more resources and have more land for settlement. THESE FACTORS ARE THE EFFECTS OF THE ACQUISITION OF THE OREGON TERRITORY
what borders did the United States gain when it acquired this territory in 1776
No. We lost territory.
The US gained Alaska in 1867.
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the US gained Florida territory by threatening to police the territory so the Spanish gave it to them.
The US gained control of the Utah Territory based on the treaty with Mexico that ended the Mexican War
Yes, Guam became a US Territory as a result of the Spanish American War.
California and the American Southwest.
Puerto Rico is not independent, it is a US Territory.
American Samoa and the US Virgin Islands.
All the southwest. See related questions.