The huge rise in America due to BLM marches/protests?
I'm sure they had some impact, but not a significant one. There are plenty of places with protests that aren't having spikes, and plenty of places with spikes without huge protests.
The reason is horrible leadership and a government that views the economy as the meaning of life.
Only the Northeast states were really hit hard as a region, and their curve looks like any European country. They had two weeks of steadily declining cases and hospitalizations. Their R value was well below 1. They opened and their cases kept going down.
The places not hit hard thought that the first wave was over. In reality, their curve was flat or ambiguous when they reopened. They never really had a wave. It would be like if Andalucia in Spain had opened up 3 weeks earlier, because it wasn't that hard hit, and they all started saying "we aren't Madrid." A month later, Sevilla would be in crises.
So you had a bunch of places with a significant amount of cases in the population, and they opened up. The whole thing gets politicized due to the fact that the United States is not United, and the only national leadership has discouraged mask use and mocked the crises for political ends. Southern states compete to open up quickly, and messages about Freedom and the economy take hold as the CDC is pushed out of the national discourse. For more than a month now, the CDC has had no significant public voice as the Trump administration has found their message of safety counterproductive, and Trump has tracked the CDC's head, Dr. Fauci as a threat, with far more public trust and popularity than he.
There was nothing stopping these numbers circulating through the population. 90% + of people walking around in Florida, Arizona, Texas etc. are not wearing masks. People didn't see death, didn't know anyone dying, and the abstract statistics have no real impact on their behavior. People are out in droves. It's summer time. It's all over. They are mobbing bars, clubs, shops, etc. They don't socially distance. They plop their obese, science hating asses down in large buildings with recirculated air conditioning. The answer to "why is it happening there" is the same answer to why it happened anywhere in the first place. If you don't do anything about it, the virus can spread exponentially.
I'm sure however that in addition to blaming roaming immigrants, black lives matter and antifa will now be blamed. It looks gay to wear a mask though, huh. Fogs up my fucking glasses.