The answer is because the Europeans began to arrive on the shores of Eastern North America
The industrial revolution affected economic growth during the the late 19th and early 20th century. Also had a affect on immigration during that time period.
US payrolls increased by 32% during the 1960s, the highest growth in jobs by far of any decade during the postwar period. Government tax revenues grew by 65% from 1965 to 1970.
A. New Mexico was a foreign land.
B. New Mexico's people were Spanish-speaking non-Americans.
C. New Mexico was a lawless territory, full of violence and evil.