I'm not sure anyone said that the /next/ revolution would happen in the US. Actually, I'm more inclined to think (hope) that the revolutionary process will deepen in Latin America. That said, if we are revolutionaries here in the US we have the obligation to build a revolutionary party and mass social movements, that take the direction of anti-imperialism and independence from the bourgeois parties, here in the US.
The more deeply we build a revolutionary movement here; the more freedom of movement our comrades overseas have. That is, we need to build movements that challenge US imperialism to the point where it's not possible for US imperialism to undermine/overthrow revolutions in Latin America, Asia, Africa, etc.