My “go-to” source for “What would Dewey Do?” is in fact an article of the same name:
https://books.google.com/books?id=3wUEAAAAMBAJ&pg=PA10#v=onepage&q&f=false
https://books.google.com/books?id=3...48 Special Issue: What will Dewey Do?&f=false
Which pretty much sets forth Dewey’s plans once in office. This is important since several things are going on between this and next election. For one thing Dewey planned increased defense spending across the board whereas Truman had been cutting and disbanding the Army and Navy in favor of the Air Force and the Atomic Bomb as America’s main offensive/defensive force. (In fact that force too would be subject to deep cuts and manpower reductions) This was increased during Truman’s second term to the point where the Navy could not blockade North Korea when ordered to do so since it didn’t have enough ships available!
Dewey’s budget increases are going to allow a LOT of OTL constraints that lead to both the Korean war and later issues to possibly be avoided.
But let’s see:
The Communist Chinese forces enter Beijing at the end of January 1949. Dewey is just sworn in (January, 20) so likely we still see an increased aid package but not much else as there’s not a lot the US CAN do at this point. This wasn’t seen as the ‘end’ of the Nationalists but it wasn’t seen as a good sign either. (In fact the collapse is pretty rapid after this and frankly I can’t see Dewey getting the blame for this, nor does he have time to really do anything about the situation). The PRC is announced in October and immediately recognized by the USSR. The Nationalists were in full retreat and pushed off the mainland by the end of the year there’s really no way Dewey could have effected that outcome short of direct intervention and if he needs to deflect he can always blame Taft and the Democrats.
The Berlin Blockade and Berlin Airlift is still going on, (and will be till May 1949 if everything goes the same as OTL) there have been US B-29’s in Europe since July but no A-bombs have been transferred to Europe. NATO is signed in April the organization fully formed and operational by August. The Soviet Union announces and the US confirms their first A-Bomb test also in August. (OTL this prompts Truman to allow research on the Hydrogen Bomb but with Dewey’s new budget that might have started a bit earlier)
So onto 1950:
In January 1950 Senator Kefauver introduces a resolution to investigate organized crime in the US. OTL, Hoover opposed this as he wanted the FBI to focus on political organizations and espionage activities. TTL he’s likely Attorney General and awaiting a Supreme Court slot per the agreement with Dewey. So Dewey may put pressure on his replacement at the FBI, (likely long time Hoover aid Clyde Tolson or Louis Nichols so Hoover could remain ‘in-control’ in theory at least) given Dewey’s anti-crime stance and if Hoover intervenes it would threaten his Supreme Court slot or even his current AG job.
As noted Dulles rather than Acheson delivers TTL’s “Perimeter Speech” and it’s likely more aggressive and more specific. But as noted that less than how Stalin reads Dewey will determine the amount of support Kim gets. Something that also has to be noted is IF Dewey is going to be more aggressive with the US military perimeter he’s going to confront MacArthur who along with Truman had been keeping South Korea under control by feeding them far less surplus military supplies than the South wanted. Keep very much in mind that the South was just as determined to go North the second they had an opportunity as the North was to go South and both sides knew this. MacArthur wanted the majority of US forces pulled out of South Korea so that when, (no one felt it was in question someone would jump but they fully expected it to be the South not the North) things kicked off the US would not be caught in the middle and more importantly the US would not be seen as an aggressor or assisting an aggressor by either the Soviets or China. (There’s very much a secondary reasoning here as well as MacArthur wanted all US forces in “Asia” to be under his direct command and preferably stationed in Japan itself where he had direct access)
Now another thing to keep in mind is unlike Truman, Dewey is someone Stalin has never met and probably has little knowledge of. Further while Stalin was wanting to build up North Koreas defenses, mostly to secure Mao’s flank while China rebuilt, he wasn’t really worried about Southern aggression and he an Mao were very much worried about US involvement in any conflict. Kim got Stalin to agree that if Mao agreed that the North could go on the offensive but then told Mao that Stalin had already agreed to going to war with the South. He then pressured Mao who ‘owed’ North Korea for support during the revolution so Mao agreed since Stalin already had done so. Needless to say neither Mao or Stalin were exactly happy to find out they’d been lied to but by that point it looked like Kim’s assessment of the outcome was correct and the conflict would be over before the US could intervene.
TTL by mid-1949 and early 1950 we’re seeing a very different US progression on “mutual defense” and military spending with the former under a more aggressive stance and the latter increasing instead of continuing to decrease as per OTL and Truman’s policy. Further the calculations in both Moscow and Beijing are changed in that it is likely now a shrinking window of opportunity AND with a more aggressive US policy does that mean they will now support a more aggressive South Korea? So the US has, depending on Congress and MacArthur, somewhere between June 1949 and June 1950 to ‘do’ something about Korea.
My thinking is that even if things manage to kick off in a similar manner as OTL then Dewey may be more supportive of threatening to use the atomic bombs on Korea and/or China than Truman was. I don’t think he will and he’ll likely ride closer herd on MacArthur and his rhetoric than Truman was. I think he will be more willing to listen to those who were worried about Chinese intervention as by this point Mac’s “intimate knowledge” of Asia will have been called into question. In essence the US will probably do about the same if not a little better than OTL Korea to this point By October the UN forces are on the 38th parallel while South Korean forces are beyond it and Mac is agitating to follow them up and that there is no danger of Chinese intervention.
Here’s where things get sticky. First of all is the question of does Dewey survive the assassination attempt (
https://en.wikipedia.org/wiki/Attempted_assassination_of_Harry_S._Truman) that Truman did? If not then things may be very, very different from this point on!
But beyond that the question of Chinese intervention and how much threat’s and force are both available and possible to put into place to head off such a move. Further it becomes a question of allowing UN forces beyond the 38th parallel and it seems to be there was a general consensus for doing so among the UN forces leaders. There were a lot of factors in this, everything from allowing the South to take the heavy industrial areas of the North to the expedient of ensuring the North could never be an aggressor again. I think that in such a position Dewey could possibly move to a more aggressive diplomacy through the USSR and China and maybe hold back the UN forces at a defensible location north of the 38th parallel while allowing South Korean forces to advance with UN Air and Artillery Support. I’d see the Chinese advancing to occupy and support a ‘rump’ North Korea, but if when testing UN defensive lines they don’t find the same weakness’ and disorganized nature of the ‘front’ as per OTL I don’t think they will commit fully.
So even if negotiations drag, (and I’d see Dewey and Dulles threatening nuclear weapons if China does not fully come to the table) the ‘war’ will be seen as being more successful than OTL. And I think Dewey will get the credit for that.
But let’s say Kim misses his opportunity and there’s no outright conflict but a buildup of tensions on the peninsula. Likely it will get some focus and the question will remain if the South decides to go North at some point…
August 1949 OTL Truman appoints Tom Clark to replace the recently deceased Frank Murphy, so TTL this is the first opportunity to put Hoover on the Court and get him out of the way if he’s not already fired or side-lined. The ‘key’ likely would have been what Hoover had on Dewey in his files. Hoover always had little ‘political’ power and most of his power in Washington was related to his secret ‘files’ and how he wielded the power of the FBI. The supposed deal with Dewey would in theory, if Hoover could juggle it long enough, put Hoover into a ‘job’ where he would be totally free of Presidential and Congressional ‘threat’ of being fired and still allow him to manipulate the offices of Attorney General and the head of the FBI while using both to increase and expand his control through both. That is if it could be done and frankly I’m not sure Hoover would have followed through on the deal in the first place.
Being honest what would be known as the “Second Red Scare” was already underway by 1948 and by early 1949 Hoover would see FBI power and prestige on the rise again as “G-Men” were set to fight the Red Menace at home and abroad. So I’d suspect that he would renege on the deal and not accept being Attorney General or a Supreme Court position. If he remains FBI Director he can continue to fight reassigning FBI assets to “side” shows like organized crime and racial incidents and continue to push for the FBI being a “kingmaker” or breaker for any future US politicians in a similar manner to what he did OTL. If he doesn’t take the deal by mid-1950 he will be in a pretty unassailable position without having to give up the FBI and all that power that entailed and he’d be just as able to direct it towards his ends as he was OTL with little Dewey could do to him. As per OTL this way he “wins” without ever having to move to a vulnerable position like AG and having to depend on a despised “politician” to appoint him to the Court. In essence he just continues to do what he’s done from the start with more confidence and more ‘protection’ by keeping the FBI and himself on the public good side.
And in 1952 Truman decided not to go for re-election, I don’t think we’d see that from Dewey and frankly he’s got a pretty even chance at this point.
Randy