From Vizynary:
Approximately 7.1 million Americans moved to another state in 2012. That’s over 2.2% of the U.S. population. The United States has a long history of people picking up and moving their families to other parts of the country, in search of better livelihoods. That same spirit of mobility, a willingness to uproot oneself, seems alive and well today based on the visualization of migration patterns above.
The visualization is a circle cut up into arcs, the light-colored pieces along the edge of the circle, each one representing a state. The arcs are connected to each other by links, and each link represents the flow of people between two states. States with longer arcs exchange people with more states (California and New York, for example, have larger arcs). Links are thicker when there are relatively more people moving between two states. The color of each link is determined by the state that contributes the most migrants, so for example, the link between California and Texas is blue rather than orange, because California sent over 62,000 people to Texas, while Texas only sent about 43,000 people to California. Note that, to keep the graphic clean, I only drew a link between two states if they exchanged at least 10,000 people.
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