this is an effect of the decline of nationalism. there are instances of monarchs in eastern europe embracing local foreign cultures to grow their power, and some would get swallowed up by those cultures and others would meld theirs with those to create an entirely different one. nationalism gave them an incentive to actually give a shit about the people of their realm, because those people had embraced a shared, cement identity; this type of current fuckery is always about growing power for those in power.
United States