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 binational basin. They say more prevalent dryin

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