What country invaded China?

I think you are asking about the invasion of the Eight Power Allied Forces on September 7, 1901. The 8 countries were Britain, the United States, France, Germany, Japan, Russia, Austria and Italy.

China has been invaded by numerous countries. The Tatars invaded China, The Tibetans invaded China, Vietnam invaded China in 1075, The Manchu Tribes invaded in 1644, The French and British invaded in 1856. In addition they were invaded by Japan in 1895, 1931, and 1937. The previous answer is also correct.