The GDP per capita of Monaco is $185,829 USD
The GDP per capita of the USA is $65,297 USD
The GDP per capita of Europe is $27,330 USD
The GDP per capita of China is $10,261 USD
The GDP per capita of South America is $9,239 USD
The GDP per capita of Africa is $1,970 USD
Preparing to rebuild the international economic system while World War II was still being fought, 730 delegates from all 44 Allied nations gathered at the Mount Washington Hotel in Bretton Woods, New Hampshire, United States, for the United Nations Monetary and Financial Conference, also known as the Bretton Woods Conference. The delegates deliberated during 1–22 July 1944, and signed the Bretton Woods agreement on its final day. Setting up a system of rules, institutions, and procedures to regulate the international monetary system, these accords established the IMF and the International Bank for Reconstruction and Development (IBRD), which today is part of the World Bank Group. The United States, which controlled two-thirds of the world's gold, insisted that the Bretton Woods system rest on both gold and the US dollar. Soviet representatives attended the conference but later declined to ratify the final agreements, charging that the institutions they had created were "branches of Wall Street". The United States is the top donor country on the Developmental Assistance Committee (DAC), contributing almost $35 billion to foreign aid in 2017. The world economy and world banking works through the methods and dollar of America. If America falls, then all financial services and international trade would largely collapse due to the interconnected exchanges of hard currencies in the reverse direction from the trade. In short, America is the middle man and protector of the seas for all the world's trade.
After America, Europe would control most of Northern Africa and the middle east again. Financially and acting as the middle man at least. China would war with India for control of East and South Asia. Australia and New Zealand would try to join up with Canada and the UK for protection against China. The Belt and Road Initiative would probably allow China to emerge as the new middle man financially, but trade would hugely diminish as piracy would effect all oil trade through the oceans near Eastern Africa. Iran, Afganistan, and Pakistan would supply most of what China needed and what it could not get from Russia. Asia would be the least affected by oil shortages, radiating outward with South American infrastructure being the most effected.
America would probably emerge as the dominate power again after twenty years of reconstruction provided the troubles ended by 2040, if the slow climb to civil war takes as long as the first one? Who knows, China could partner with Europe to supply international trade with the required navy to make it safe again maybe? China is aging though, too long and it would just hoover what it could from the world and let the rest burn.
Africa would depopulate, probably by 1/2 to 7/8ths. But that's assuming Europe doesn't try something which could turn their mid 2010s revolts over migration into a real civil unrest?
