In the 1880s and 1890s more anglo-americans entered the southwest, largely due to the expansion of the region's

Railroads

Explanation:

Railroads played a crucial role in the Southwest when it came to people to move in the region for starting a new life. By the coming of the Transcontinental Railroad in the 1800s, it changed the situation of the economy and social condition of America. It connected the East with the West in less amount of time than through stagecoaches, wagon or waterways. The railways became the influential transport for the people because it is more safe and faster to travel long distances.

the constitution of the united states gave congress the absolute authority over immigration laws

a

"the land of the dead"