Question: The Chamizal dispute was caused by a shift in which one of the principal rivers in the southwest United States and northern Mexico?
Sentence (from "Chamizal dispute"): It was caused by a shift in the Rio Grande, as a survey presented in 1852 marked differences between the bed of the Rio Grande (in Spanish: "Río Bravo del Norte" ) and the present channel of the river.
Relevant evidence: Yes