LAS VEGAS (AP) — Arizona, California and Nevada on Monday proposed a deal to significantly cut their water use from the drought-stricken Colorado River over the next three years. The $1.2 billion proposal is a potential breakthrough in a stalemate over how to deal with a rising problem that pitted Western states against one another. The plan would conserve an additional 3 million acre-feet of water from the 1,450-mile river that provides water to 40 million people in seven U.S. states, parts of Mexico and more than two dozen Native American tribes. Cities, irrigation districts and Native American tribes in the three states will receive federal funding in exchange for temporarily using less water.