About the same percentage of Americans protested against Trump in March as French protested over the weekend.
But with 1/10 the population density, the US protests appeared smaller.
edit: numbers were wrong - about 1/4 the population density. And the US had about 0.9% of its population participate in the March No Kings protest as opposed to France's 0.7%. So the US appears to be more active than France in protests, but they can't concentrate the majority of their protests in a single city like France can.