Moving trucks, not political advertisements or policy discussions, are driving a subtle but significant change in American politics. As a result of millions of Americans moving to other states, presidential elections may be reshaped for many years to come.

There is a clear trend: lower-cost, business-friendly states are attracting more residents while high-tax, highly regulated states are losing them. This reflects a deeper realignment of where Americans want to live, work, and raise families, not just a peculiarity of the pandemic.

California, the once-golden emblem of prosperity, is steadily losing people. People are relocating to the Carolinas, Florida, Tennessee, and Texas. Similar declines…