Answer: If you are talking about the Mexican American War, they must of crossed Texas.
Explanation : I am assuming you are talking about Border Dispute between Mexico and America.
The correct answer is the second answer:
population increases.
The demographic transition model describes how a population of a country transitions from high birth and death rates to low birth and death rates, as a country becomes more industrialized. This transition occurs through five stages (refer to attached image). In the second stage of the <span>demographic transition model, a country's population increases because birth rates continue to increase, while death rates fall considerably. </span>
They had strong ties with Britain.