Answer:
Extend the nation
Step-by-step explanation:
The United States desired to take the Southwest because they wanted to extend their rule towards the Pacific. Railroads played a crucial role in the Southwest when it came to people to move in the region for starting a new life. The Transcontinental Railroad in the 1800s changed the situation of the economy and social condition of America. New industries in the Southwest during the 1890s, especially in agriculture and mining, attracted many migrants.