The USA controls ICANN and IANA, who together control the DNS root, as well as controlling all so-called "generic" TLDs through ICANN. Only some country TLDs are actually outside of US jurisdiction, as many of the delegate to USA-based registry providers. ICANN/IANA still control whether or not those countries even get to have domains, so the USA could decide that if the Netherlands wouldn't block motherless-dot-nl then .nl shall no longer exist.

DNS being centralised in the USA was potentially problematic when they weren't abusing their power. Now that they are actually abusing their power, it is actually problematic.