Empress Dowager Cixi: She was a Chinese empress dowager who supported the Boxers and became the symbol of resistance against foreign influence.
Eight-Nation Alliance: An alliance of eight nations (including U.S., Japan, Russia etc.) that intervened militarily in China to crush the Boxer Rebellion.
Open Door Policy: A policy proposed by US Secretary of State John Hay in 1899 that aimed at preserving Chinese territorial integrity and safeguarding equal trading opportunities for all nations in China. It indirectly led to increased tensions culminating into Boxer Rebellion.