You see, I actually managed to create a de facto dictatorship in America in my TL:
The crimes of Stephenson were never discovered, so the Klan rise of the 1920s continue into the 30s.
Calvin Coolidge runs for a 2nd term, he would of course win thanks for the great economy, nothing would go wrong except when the Depression hits. Coolidge's lack of intervention further brings disaster to the economy, and Quentin Roosevelt (TTL's FDR) proposes a "Fair Deal" (The New Deal), he wins the election with Garner as VPOTUS, but he is killed by a Italo-American Proudhonist (Anarchist) and Garner becomes POTUS. (Also remember that the Prohibition never ended)
Then as Garner goes Hoover with some half-hearted attempts that further drag the economy downhill, Huey Long becomes the main leader of the American left, making Quentin a Martyr and promising to fulfill his dream. Adding his populism, charisma, and powerful allies (like Coughlin), he manages to defeat Garner in the Democratic nomination and Alf Landon in the 1936 elections.
Long soon finds congress to be uncooperative, he bypasses with executive orders, the SCOTUS blocks him, he accuses them of letting America suffer and starve, he attempts to pack the court, and then a Business Plot conspiracy led by George van Horn Moseley, D. C. Stephenson, and Charles Lindenbergh attempts a coup to oust him.
Klansmen take the White House while Lindenbergh (who is Speaker of the House TTL) uses the Army and Klan intimidation to push an impeachment attempt. But due to an spy, Long manages to escape before that, calling Loyalists under General Patton and the American people to resist the coup by radio, after a battle, Washington is retaken and the conspirators defeated.
Long then blackmails J. Edgar Hoover (due to his homosexuality) and uses the FBI to arrest several opponents and break down his enemies, censoring Press, packing the Court and even arresting SCOTUS members due to possible involvement in the conspiracy. He releases Stephenson's crimes to the world, causing general outrage against the Klan and causing its decline. Long starts implementing the policies of the Fair Deal witch result in a sharp improvement of the economy by the 1938 midterms.
Long created his own paramilitary militia of loyalists, growing paranoid of the army, he purged several rebellious generals, he also leaves the Democratic Party and declared himself "Independent" (while using congress puppets to create his own "America First Party" to exert his influence). Using his charisma, bribes, the economical improvements, blackmail, intimidation etc, the America First scores a massive landslide all over the nation in 1938, cementing Long's control using the FBI, a puppet congress, puppet Supreme Court, and puppet governors, Huey Long now was the de facto Master of America. Or as one may call it: "Longmerica."