this is how i would describe it too

To add to this, I think there are some assumptions in this reasoning that are worth addressing.

so then americans as a whole seem to have power in maintaining this system, from protecting it via participating in the military, working in jobs that manage this imperial system (e.g. finance, defense, etc.), selecting the american candidates that pursue their favorite imperialist policies (i.e the policies that give them a larger share of the super profits)

This is essentially how the system functions, but it presupposes more agency on behalf of the Statsian workers than exists in practicable reality. For example, if one is selecting one imperalist over another in an election, it's worth noting the vote for imperialism is fully baked in.

Similarly:

in turn, the domestic capitalists in america need the support of the americans, so they and the americans come to an agreement on how to divide the superprofits from the factories abroad among them

It might be literally true that the domestic capitalists need the support of the Statesian workers, but it depends on what we mean by "support." At present the Statesian workers do not have any viable organized resistance to provide any actionable counterbalance. The support is implicitly baked into the system as is, and of course the bribes, propaganda, systemic degradation of any meaningful angency, etc., solidify this. The Statesian workers have no real say in how the spoils are divided; they simply take what they can get at best.