Name one state that borders Mexico.

California is a state that shares a border with Mexico, making it the correct answer. The U.S.-Mexico border stretches approximately 1,954 miles, and California comprises a significant portion of this boundary. The border between California and Mexico is characterized by various geographic features, including deserts and rivers, and includes major entry points such as San Ysidro, which is one of the busiest border crossings in the world.

The other states listed—Montana, Michigan, and Idaho—do not share a border with Mexico. Montana is located further north and borders Canada, while Michigan is situated in the Great Lakes region and also does not reach Mexico. Idaho is located in the northwestern part of the U.S. and has borders with Canada and other states but lacks any border with Mexico. Understanding the geographic layout of the United States is essential when identifying state borders, especially in the context of immigration and citizenship matters.