If Trump wins legitimately, of course there will be protests from different groups as is normal but there will be increase in protests whenever he tries to assert himself as an autocratic dictator. So instead of race or reproductive rights, I think the top protest issue will be a fight against the USA turning in Hungary, Turkey or worse Russia.
If Trump wins with dirty tricks after he loses as he tried to and came way too close to succeeding last time, the level of civil unrest will be historically spectacular, but not seeing civil war, as even if a resistance tried, Trump's dictatorship would crush it with violence.