Try this idea...
Grensbeck-7 in this Q6 world fusion power generation was discovered/invented in 1923! It seems to be a type of
Polywell Fusion. Scientists are rechecking their facts bigtime! Electric power costs plumeted. The depression still hit hard, but rural electrification was quick and easy.
The local year is 1936. Most new ships are built with fusion powerplants. Fusion power plants are small enough to power Airships (the Hindenburg's schedule was changed in order to retrofit it with a much lighter and more powerful fusion engine thus the disaster never occured). Hitler at first disliked Fusion as Jewish science, so Germany is behind in it's recovery.
Meanwhile the USA is coming out of the depression at breakneck speed. The changed ecconomics of energy has convinced FDR to put his faith in the ideas of
Keynes. Except in the Deep South (which, as in Homeline history, is rejecting the New Deal in it's Statehouses, even thought the people fully support it) America is more prosperous than in the 1920's. More importantly, outside of the Deep South, this prosperity is widespread all levels of society enjoying the benefits. In many ways this America is a TL7 society already.
France and Brazil have followed similar paths, Argentina, Canada, Australia, and many other nations are following the successful example. Meanwhile, Britain's elites are torn. A Keynesian world wouldn't have much use for social class hiearchies or traditional elites. The USSR embraced the new Fusion power system, but there are rumblings deep in the Soviet state. Have they moved too fast. Hitler's Germany, Italy and much of Eastern Europe is playing catch-up.
Meanwhile, Franco has a quandry. Hitler and Mussilini promised aid, but a self-confident France has promised trouble. Who does he choose to believe?
Centrum feels that if they can get the Nazis up to speed, this world will consume Homeline's time and attention all out of proportion to it's importance.
Homeline wants to push events in Britain toward an exceptence of Keynes' ideas and a vibrant UK able to ally with France and keep Hitler in check.
The Cabal wants certain archeological discoveries made by the Soviets and a nice stable colonial regime in Bagdad that will let independent scholars research in their libraries and archives. They also see a 1930's Hollywood as a great recruiting area ( as it would be in most histories with a high similarity to Homeline's