First violent conflict between protestors fighting against injustices (in their view) and police institutions, followed by overthrowing democratic institutions

First violent conflict between protestors fighting against injustices (in their view) and police institutions, followed by overthrowing democratic institutions and replacing with a single-party dictatorship (which hasn't happen so far in the US, but I've heard of democracy being eroded and people fearing that Republicans would overturn the ballot results in 2020).