Answer:Americans also settled in the Oregon Country, a large territory between California and Alaska claimed by both Britain and the United States. During the mid-1800's, the United States gained control of the Mexican lands and the southern part of the Oregon Country, and the nation extended from coast to coast
Explanation:
I think i know the answer it might be <span>manifest destiny</span>
It wont let me answer, I’ll put my answer in the comments
Decade of long depression
The rate of production of new biomass by an individual, population, or community; the fertility or capacity of a given habitat or area.
