1. The interactions between the settlers in Texas and the Mexican government developed and changed over time due to instances such as wars (Revolutionary War, War for Mexican Independence) , population distribution (explosion of settlers after the Mexican government allowed settlers into the area), and land claims (by both the US and Mexican governments).
2. Manifest Destiny impacted the US government's position on the Texans request to be annexed by the idea that the United States was destined to own and occupy the entire North American continent. This destiny journey began with Texas being annexed, leading to the Mexican-American War.
3. Many northern states were against the annexation of Texas for reasons including: Texas being a slave state would further expand the amount of slave states in the Americas, and due to the colossal size of Texas the amount of slavery would increase immensely.
4. The Mexican-American War reshaped both the United States and Mexico. Mexico did not want to annex Texas to the United States. Also, Mexico and America differed on where the border for the new state of Texas would fall leading Congress to declare war on Mexico. After the war, Mexico agreed to annex Texas; agreed to the Rio Grande river being the border between Mexico and Texas; and gave a large area of land to the United States. Present-day Texas is large and rich in oil and resources assisting in a strong economy for the United States.