Y 1846, the population of the Northwest a. went from about 5,000 people to only a few. b. went from only a few to about 5,000 people c. went from only a few to over 50,000 people d. remained unchanging.

b.went from only a few to about 5,000 people

Explanation:

In 1846, the Northwest region of the USA saw a strong increase in population size, even amid the pre-war tensions and the war itself between Mexico and the USA. This was due to the fact that this region had good infrastructure and resources that guaranteed an improvement in the lives of its inhabitants, causing the birth rate to increase and the death rate to decrease, in addition to attracting a strong number of people. immigrants to this territory, which caused the population to increase admirably.