I know it's pretty common shorthand to describe American post-war interventions as "Imperialism". But Imperialism before Bretton-Woods was a very specific and intentional international policy - literally conquering and/or colonizing land to secure resources. Which is a bit different than America's "spheres of influence" thing today.

The two are very linked - the tacit agreement of the postwar order was for America to use its might to expand a common market on behalf of the shared benefit of NATO members. But the collapse of today's "American empire" does not mean the end of empires. If anything, the opposite: instead of one common international market, we will return to a 19th century scramble for land.