Statistically speaking, Idaho is one of America’s greatest economic success stories. The state has low unemployment and high income growth. It has expanded education spending while managing to shore up budget reserves. Brad Little, the state’s Republican governor, has attributed this run of prosperity to the mix of low taxes and minimal regulation that conservatives call “the business climate.”

But there is another factor at play: Californians, fleeing high home prices, are moving to Idaho in droves. For the past several years, Idaho has been one of the fastest-growing states, with the largest share of new residents coming from California. This fact can be illustrated with census data, moving vans — or resentment.

Home prices rose 20 percent in 2020, according to Zillow, and in Boise, “Go Back to California” graffiti has been sprayed along the highways. The last election cycle was a referendum on growth and housing, and included a fringe mayoral candidate who campaigned on a promise to keep Californians out.

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