Question

What was the Boxer Rebellion a response to?

Answer 1

It was in response to the foreign (esp. western Christian) infiltration of China

Answer 2

Adding onto his comment, it was to protect China's traditions against western imperialism.

Answer 3

In 1900, in what became known as the Boxer Rebellion (or the Boxer Uprising), a Chinese secret organization called the Society of the Righteous and Harmonious Fists led an uprising in northern China against the spread of Western and Japanese influence there.