Why is it important to know what was happening in United States' politics at this time? How did the politics in the United States affect the annexation of Texas?

Because it has a great impact.

Explanation:

It is very important to know what was happening in United States' politics at this time because the politics have a great impact on the region present around and within the United states. This politics is responsible for the peace and harmony of the country so if the political situation is good, there is peace and harmony in the whole country or if there political instability, there is high chances of violence disharmony in the states.

answer; i believe its (cpr);