The Taiping Rebellion, a civil war affecting southern China, began in December of which year?

Wow! 100 million dead! Makes our civil war look a school yard rumble.

Probably the bloodiest conflict ever until the world wars. Events like the Taiping and Boxer Rebellions are the reason why the current regime in China is so worried about Falungong, a similar mass spiritual movement that would be a huge challenge should it turn against the government.