Read the text below before answering the question:
The War Changes American Society
The demands of the war also caused Mexicans to cross the border into the
United States. Many Mexicans were living in poverty in Mexico and wanted
better lives for themselves and their children. Most immigrated to the states
throughout the American West, where they sought work on large ranches and
farms. Increased demands for food and a decrease in American farmworkers
created jobs that Mexican migrants were willing to fill.
World War I brought increased immigration to the United States from
A Britain
B Japan
C France
D Mexico

The answer is D Mexico because the text explicitly mentions that many Mexicans crossed the border into the United States during the war. It states that Mexicans were living in poverty in Mexico and sought better lives for themselves and their children. They immigrated to the American West and found work on large ranches and farms. This increased immigration from Mexico was a result of the demands of the war and the need for labor in the agricultural sector.