The video of the incident has been viewed more than 10 million times on YouTube: police officers in McKinney, Texas, breaking up a pool party of mostly black teenagers, one officer pinning a black teenage girl in a bikini to the ground, and then pulling his gun on other teenagers.
The incident quickly became part of the ongoing national conversation about police tactics, use of force and race. But it has also dredged up memories of the United States’ long, fraught history with race and swimming pools.
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