/kloc-what are the social problems faced by the United States, Japan and Russia in the middle of the 0/9th century? How is it solved?

The United States is facing the contradiction between the capitalist north and the slave south! The civil war broke out like this!

Russia is facing the problem of serfdom. Due to the development of capitalism, Russian serfdom increasingly restricts its development and becomes the biggest obstacle to its capitalist development. The reform of serfdom is imminent!

Like China, Japan's self-sufficient feudal economy made it the target of bullying by foreign powers. Facing the unprecedented national contradiction and the contradiction between the domestic feudal class and the bourgeoisie, reform is imperative, and the Meiji Restoration came into being!