My family has been in the US for 4 generations but we still keep in touch with the relative in Europe. This is what I’ve learned:
1) The Polish side hates the Russians, REALLY hates to Ukrainians and doesn’t trust the Germans.
2) The French fear the Germans, loathe the British and believe the Spanish and Italians are filthy people.
3) The Irish hate EVERYBODY who is not Irish.
4) The Italians think the Greeks are pigs, the Croats are modern day Nazis and the Swizz are snobs.
It’s not our fault that nobody is as awesome as the Irish.
This is human nature.
I saw it in Asia in the navy years ago: The Japanese hated and looked down on everybody except the Chinese, whom they merely hated, but respected somewhat. Everybody hated the Japanese. The chinese looked down on everybody. The Filipinos hated the Japanese, of course, and resented the highly successful Chinese in their midst, and everyone around Asia thought the Filipinos were subhuman. Any adjacent countries with different languages and cultures typically hated and suspected each other.
Amongst Buddhist temples established in the US for Southeast Asia refugees and immigrants after Vietnam, the Vietnamese would only go if the temple had a Thai or Vietnamese monk, Thais would only go to a Thai monk, Cambodians only to a Vietnamese monk, Burmese only a Burmese monk, or a Thai monk in a pinch.
In the hospitals in Honolulu, the Japanese immigrants and descendants would only go to Kapiolani, with a largely Japanese medical staff, the Chinese and the Filipinos only to St. Francis with a largely Chinese medical staff.
A one world government is only the dream of Marxists and Muslims, who love to dominate and tell others how to live, as well as naive useful idiots drenched in quasi-Marxist dreams. When an institution such as the UN is finally created, we see it attracting only the corrupt and the power hungry and the useful idiots.