What would be the global effects of a (somewhat) isolationist US after WW2?

So let’s just say that some of the main scientists for the Manhattan Project die in a plane or car crash. Operation Downfall is launched, US casualties are over two times what they were IOTL, comfortably placing it above the American Civil War as the bloodiest war the US has ever fought. Truman is even more unpopular than IOTL and gets beaten by Dewey or Taft and NATO never comes to be, the Marshall Plan is neutered and Eisenhower decides to not run for President. The US is only loosely tied to a ruined Europe and the occupation of Japan ends after four or five years. What is the global effects? Especially in relation to the Cold War.
 
In the absence of active resistance from an American-led coalition, the Soviet Empire would have been free to expand. The first victims of this expansion would have been European. However, it would not be long before Communist governments were installed in much of what, in our time line, was known as the Third World. Indeed, as the impetus for the expansion of empires often comes from the periphery, most of the invasions, occupations, coups d'etat, and their like would probably have been the work of the leaders of satellite states. (Consider, if you will, the role played, in our own time line, by Cuba in Africa and Latin America in the 1970s and 1980s.)

Life in the peoples' republics of Asia and Africa would, in all probability, have much in common with that suffered by the people of China in the 1950s and 1960s. That is, there would be enormous deprivation, punctuated by periods of dire famine and crises comparable to the Cultural Revolution and the Great Leap Forward. Enough people would survive, however, to change the way that American's viewed Asia and Africa. Whereas the Americans of our own time line viewed the Third World as an arena in which they competed with other people of mostly European descent (i.e. the Russians) for the hearts and minds of people of color, those of this alternate reality would increasingly equate Asians and Africans with the political system of their conquerors.

The presence of large numbers of European refugees would do for America as a whole what, in our time line, Cuban refugees did for Miami. That is, there would be a sufficient number of people telling tales of oppression to temper the natural naïveté of Americans and counter the efforts of those who sympathized with Communism. Indeed, one can imagine a cohort of European intellectuals comparable to the one that, only a few years earlier, had fled National Socialism and the consequent displacement of members of the first wave by those of the second. This, in turn, would have done much to change the character of American intellectual life and, in particular, the composition of university faculties.

At the same time, the reduction of "the West" to the United States (and, one presumes, a closely connected Canada) would increase the degree to which Americans were conscious of the uniqueness of their nation. This, in turn, would drive a stake through the heart of the "liberal universalism" that played such a powerful role in American public life in the post-war period of our time line. In other words, rather than thinking that "most people are basically like us and are on their way to enjoying the same sort of political and economic system that we do," Americans of this alternate time-line would be more likely to think, "we are fundamentally different from everyone else in the world."

If these things happened, it would take much of the wind out of the sails of the civil rights movement of the 1950s and 1960s. It would also prevent the proposal, let alone the passage, of the Immigration and Naturalization Act of 1965.
 
For one thing, Europe might be a lot less stable. On the plus side, we’ll probably see fewer tin pot dictatorships in Latin America.
 
I think Britain and France might try and hold on to their empires a bit longer and be much closer together. Maybe they form a kind of EU on a UK-France axis rather than France-Germany.
 
Hoplophile, Given the absence of a theory of an expected imperialist general war by 1951, why will the PRI, for example, not be following a new course line under Togliatti?
 
Relevant post from a relevant thread:

France and Britain are in no shape to stand up to the Soviet Union by themselves. The economic recovery that allowed them to obtain nuclear weapons when they did was heavily financed by the Marshall Aid. Even if we assume that they manage to maintain their OTL schedule, Britain only gets their bomb three years after the USSR does and France a whopping 11 years. Meaning prior to that, their effectively helpless because post-demobilization their armed forces weren’t up to the snuff of taking on the Red Army. As it was, even with the American garrison forces hanging around, the late-40s and early-50s saw the Red Army maintained a overwhelming superiority in conventional forces and the only effective military deterrence against an invasion the prospect of what forces (particularly the nuclear ones) the US could build-up in a long war.

But then between the drained and shattered West European economies and a isolationist US not undertaking the massive efforts to support anti-communism, the communist movements in Western Europe would be far stronger and the Soviets probably don't need to invade anywhere. At best, the Soviets would just isolate and ignore them. At worst, they'd undergo strong domestic shifts - maybe even full-scale revolutions - and be just another bunch of satellites. That all seems to be what Stalin anticipated happening in ‘45-‘46 when he was under the impression the US would be leaving by early-1947.

The real conflict of the late-20th century would probably be between the USSR and China, when the Sino-Soviet split occurs.
 
For one thing, Europe might be a lot less stable. On the plus side, we’ll probably see fewer tin pot dictatorships in Latin America.
The U.S. would in all likelihood be involved in Latin America, in a bid to make the two ocean barrier hold, so to speak.
 
For one thing, Europe might be a lot less stable. On the plus side, we’ll probably see fewer tin pot dictatorships in Latin America.

The U.S. would in all likelihood be involved in Latin America, in a bid to make the two ocean barrier hold, so to speak.
Communism was more of a justification to interfere, much of it was a fear of the nationalization of American business assets in Latin America.
 
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