Under the terms of a 1945 agreement, Mexico and Texas are supposed to send each other a certain amount of water. Texas’ share comes from the Colorado River, while Mexico’s originates along the Rio Grande.
Each year, Mexico’s allotment is supposed to total 350,000 acre feet (one acre-foot of water is equivalent to 326,700 gallons). But the country has fallen behind on its deliveries, and currently owes 380,000 acre-feet to the U.S.
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