Due to its historical improtance I think it would be good to add culinary arts to the tech tree, somewhere after aestheics and as a prerequisite to chemistry. Most foods have association with some national idenity and it has an important role in culture, plus cooking is a basic form of chemistry.

on roads within fat cross
, +2
, TV station as Corpo
under free market and if losing a war, only 25% of cities need factories. then you should have access to the associated Civics, but they should still be optional
birth rate(artist)
Agriculture has different techniques, but again, same end product is desired. However, the type pf communism Marx wanted, to its fullest extent, was clearly a completely different beast than other who have claimed to be communists, like Pol Pot, they obviously had almost no views in common. East Germany was called the German Democratic Republic, but was obviously not the same type of Govt as democratic Switzerland, USA or Venezuela