By SUSAN MONTOYA BRYAN, Associated Press

ALBUQUERQUE, N.M. (AP) — One of North America’s longest rivers, the Rio Grande — or Rio Bravo as it’s called in Mexico — has a history as deep as it is long. Indigenous people have tapped it for countless generations and it was a key artery for Spanish conquistadors centuries ago.

Today, the Rio Grande-Bravo water basin is in crisis.

Research published Thursday says the situation arguably is worse than challenges facing the Colorado River , another vital lifeline for western U.S. states that have yet to chart a course for how best to manage that dwindling resource.

Without rapid and large-scale action on both sides of the border, the researchers warn that unsustainable use threatens water security for millions of people who rely on the binat

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