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Election Day, 1936: An epic Roosevelt landslide. 27.7 million votes to the Republicans' 16.6 million votes. Roosevelt also carries every state except Maine and Vermont. Moreover, Democrats take both houses of Congress by majorities of four to one. Doubts are raised that the Republican Party can even survive until the 1940 elections.
In our timeline, the Republican Party survived because of Roosevelt's "court-packing" scandal and the New Deal budget cuts. But what if those incidents didn't happen and the Republican votes in the 1938 congressional elections didn't improve, instead getting even worse?
Road to One-Party Rule
Disbandment of the Republican Party
With the loss in the 1938 congressional elections, Republican leaders started considering disbanding the party and donating all their assets to charity. In 1940, FDR won again, this time carrying every single state, an electoral phenomenon that had only happened in 1788 and 1792 so far. After this, the Republican Party agreed to disband. All Republican Party assets were donated to charity as previously mentioned.
FDR Takes Charge
After the Republican Party was disbanded, FDR started to feel nervous about what the other Democrats might do about it. But then he discovered that since there was no opposition party, he could try to make the government more open to his reforms. However, due to this, FDR was accused of trying to establish a dictatorship, and the American Communist Party, funded by the USSR, started raising funds locally instead of relying on the Soviets.
Despite this, FDR managed to replace most of the Supreme Court judiciaries, including the Chief Justice. Republican congressmen were removed from their positions due to party disbandment, so Democrats, along with a few Communists, filled the vacancies. FDR did make sure the Democrats were liberal Democrats, though. Then, FDR purged conservative Democrats from the Democratic Party, although he didn't kill them as Stalin did with 'disloyal' Communist Party members.
In 1941, when America joined the war on the side of the Allies, the Communist Party received a popularity boost due to the popularization of Stalin as a very trusted ally. Then, in the following years, World War 2 went on the same way as in OTL. However, in 1944, FDR came close to losing his job as he narrowly won the election against the Communist candidate, Earl Browder.
On January 20, 1945, towards the end of WW2, Roosevelt was inaugurated into his fourth term. However, he died on April 12, 1945. This left his Vice President, Harry S. Truman, to finish his fourth term for him. Meanwhile, some former Republican Party members joined either the Democratic Party or the Communist Party.
Truman Takes Control and the Beginning of One-Party Rule
In the wake of FDR's death, the American people were shocked, to say the least. After 12 years, they felt that FDR being president was as natural as the changing seasons. The new president, Harry S. Truman's anti-Soviet stance made him unpopular in an America where the Soviets were seen as America's most faithful ally.
However, this quickly changed in the following years as the Soviets disputed with the Western Allies over Germany and Berlin. During and after the Berlin Blockade, the Communist Party experienced a significant member loss. Truman took advantage of the Red Scare, and on January 20, 1949, at his inauguration, Truman announced one-party rule over the United States.
In the days following his inauguration and the announcement of one-party rule, Truman introduced more legislature to consolidate one-party rule that increased his controversiality even further.