We're in a historic drought, the kind that doesn't typically happen but every thousand years. The problems though are that much of the USA wasn't intended for agricultural use, but was prarie grass. Those grasses either were created by GOD to be within those ecosystems or Nature evolved those grasses to develop and take hold there. As soon as we relocated the populace through Manifest Destiny, then urbanization required regular piping of water from aquifers in order to handle the basic water needs of those citizens but also the incredible amount of water for agriculture. California produces something akin to 1/3 of the produce for the USA. There is insufficient water to last more than a year. Scientists have been complaining for nearly four years now. The populations have been on some water restrictions, but not nearly what would be necessary to get past a year more of it. If interested, look up the long term effects of the Great Drought. They included diverse things like the effect on water transportation of river barges. As the water levels plummeted, the Army Corps of Engineers has to remove debris such that the bottoms of the river barges can pass. The straits are narrower. The amount of displacement by the weight of the payload means less can be transported. Not only very expensive added on cost to food and materials, but it means delays to those materials. In addition, the drought has historically caused a rise in coccidioidomycosis. This is a multifactorial disease in which soil erosion is inhaled, causes fungal spores to become permanently lodged in the alveoli, and causes numerous long term health issues. It killed children during the Great Depression Dust Bowl. When soil is so dry, then the natural microbes that fix nitrogen are lost. The humus dries up. The soil becomes sterile. Many species die. The long roots of trees can die, and these trees are used for windbreaks. Worse erosion then occurs. What once was fertile becomes terribly lifeless, and it takes an enormous amount of time to create new soil. Try looking up the US Drought Monitor if interested in the full state of this drought. If it persists, it means displacing people to the East, and it's not just in California, though they have the worst of it.