Capitalism-imperialism: a system based on endless growth and expansionism, where the proletariat in the imperial core is pacified by the crumbs the capitalist give it from the plunder of the colonies; the crumbs also allow the proletariat to buy the goods and services, thus maintaining demand, sort of.
Late stage capitalism-imperialism: the entire planet in conquered, the "low-hanging" resources have been consumed, there is nowhere left to expand, except inward, so the capitalists start cannibalizing the proletariat in the imperial core by giving it less and less crumbs, in order to achieve even higher rates of profit; to remain in power, while the masses see their quality of life decline / starve, they need to consolidate more and more power. More than the absolute monarchs ever had.
> the entire planet in conquered, the "low-hanging" resources have been consumed
that same sentence canNOT be used to describe any human endeavor in any other epoch. We are in the anthropocene now.