Under the terms of a treaty signed in 1944, the U.S. is obliged to give Mexico water from the Colorado River, while Mexico must transfer water from the Rio Grande and its tributaries. But in recent years, Mexico has fallen behind on its obligation. The accounting for the water sharing gets tallied in five-year cycles. And at this point, in the fourth year of the cycle, Mexico currently owes the United States 380,000 acre-feet of water. Read more at The Washington Post…