The document discusses Japan's invasion of China in the early 20th century. It provides background on Japan's increasing control over areas of China from 1895. It then examines the reasons for Japan's full invasion of Manchuria in 1931, including Japan viewing China as weak and seeking to replace it as Asia's dominant power. The document also looks at the impact of the Japanese invasion on China, including the brutal Nanjing Massacre that sought to terrify the Chinese population into submission but had the opposite effect of galvanizing resistance. Finally, it evaluates how the war with Japan contributed to the growth of the Chinese Communist Party by allowing it to position itself as a force resisting foreign aggression.