Answer:
The United States underwent territorial expansion between 1790 and 1850. This resulted in a transformation in the borders of the country, where the territorial boundaries of the United States corresponded to the borders of modern states.
Step-by-step explanation:
The United States government claimed that it was necessary to expand the country to the west, the further the expansion proceeded the more the country prospered. Based on this concept was made the purchase of Louisiana which resulted in the increase of the national territory. At the same time, the settlers were facing resistance from the natives in Oklahoma because they also wanted to take possession of that territory. Given this scenario, the US government established that a portion of the territory would be given to all citizens who worked and left the produce land (in the midst of indigenous hostility), this also helped to expand the national territory. Finally, California's golden fever also influenced the country's expansion. Thus, it is true to say that the national borders of the United States corresponded to the borders of modern states resulting from territorial expansion.