Margaret O. Wilder is associate professor in the School of Geography and Development and in the Center for Latin American Studies at the University of Arizona. She is an appointed member of the Good Neighbor Environmental Board, advisory to the president of the United States on U.S.-Mexico border environmental issues.


The year 2019 marked a significant milestone in U.S.-Mexico hydrodiplomacy: seventy-five years since the two countries adopted the Treaty of 1944, which apportioned between them the waters of the Rio Grande, Colorado River, and Tijuana River.