Massive civil war led by Hong Xiuquan (claiming to be Jesus's brother) against the Qing Dynasty. Taiping Heavenly Kingdom established in Nanjing. Eventually crushed by Qing forces with Western support.
British and French vs. Qing, sparked by trade disputes and opium. Western victory led to Treaty of Tientsin, granting greater market access.
Another major northern uprising against the Qing, eventually suppressed.
Period of relative peace and attempted modernization under the Qing. Ultimately undermined by internal conflicts and continued foreign pressure.