Just a little thing I did; nominal GDP map of the world in 2100. US GDP per capita is ~$1,400,000, or about $300,000 in today's dollars. (The brackets given are ~$100k, ~$70k, ~$20k, and ~$2k in today's dollars.)
It's based mostly on projecting the rate at which countries move from poor (red)/middle (brown) income to high income (blue), and which countries tend to do so. Manufacturing/export-driven Asian economies, microstates or those able to leverage a strategic position, European countries in general, and oil-rich countries (or lithium-rich, here, due to its value in fusion reactors and batteries). And then, of course, the luck of the draw and good thoughtful policy, which was mostly random.
The countries which moved from middle-income to high-income on this map are: Poland, Croatia, Romania, Russia, Bulgaria, Turkey, Serbia, Montenegro, Belarus, North Macedonia, Albania, Kosovo, Georgia, Armenia, Ukraine (European), China, Sri Lanka, Vietnam, Indonesia, Bangladesh (export-driven manufacturing growth), Chile, Argentina (lithium), Kenya, Egypt, Algeria, Costa Rica, Iran, Kurdistan (luck of the draw/good policy), and almost all of the Pacific/Caribbean microstates. From low-income to high income are: Pakistan, Ethiopia, Rwanda, Liberia, Malawi, and Uganda - these were mostly selected for creating a more interesting map, if I'm being honest. I did tend to prefer adjacency, thus the Uganda-Kenya-Rwanda-Ethiopia region being relatively well off compared to the rest of Africa.
Saudi Arabia fell to middle income status because it's much larger than Bahrain, Qatar, Kuwait, and the UAE, and thus much less able to manage the transition away from oil.
(There's a couple minor border changes for flavor, too: Ambazonia, Somaliland, Kurdistan, Abkhazia, Transnistria, Sahrawi, North Yemen, and South Ossetia getting independence, a one-state solution in Israel, and a divided Yemen.)
The map was based somewhat off of
this map. Depressing as it is, I was probably too generous to Africa; no country in Africa has escaped the middle income trap, but I'm handing that over to eight countries by the century's end.