Mexico and the United States share a border of more than 2,000 miles, and their histories and interests have often intertwined. The Mexican Revolution, which began in 1910 and continued in one form or another for the next thirty years, was keenly observed by U.S. citizens, especially those directly involved in Mexico through property ownership, investment, missionary work, tourism, journalism, and education. It differed from many other revolutions in this century in that Marxist-Leninist theory