sentences:  Mexico supported U.S. policies in the Cold War and did not challenge U.S. intervention in Guatemala that ousted leftist president Jacobo Arbenz.Under Mexican president Adolfo López Mateos, the U.S. and Mexico concluded a treaty on January 14, 1964 to resolve the Chamizal dispute over the boundary between the two countries, with the U.S. ceding the disputed territory.The Boundary Treaty of 1970 resolved further issues between the two countries.