Why is the Colorado River at a breaking point? Part of the answer lies in years of drought, dwindling water supplies and a long fight among Western states over an operating plan for the river. POLITICO's Annie Snider explains why the Trump administration is stepping in to take a larger role in managing the Colorado River, what that means for the 40 million people who rely on it and why the next chapter in the West's water wars could be decided in Washington or in court.