What is the reason for Japan's invasion of China?

Apart from the particularly rich fishery products, Japan has basically no decent large-scale minerals. As early as Lu Xun's time, China's proven coal reserves were enough for the world to use for hundreds of years. Plus the iron ore in Liaoning. In China, almost anything except oil can start the large-scale production of capitalist industries. Therefore, Japan urgently needs large-scale mining areas close to the mainland.

Reason 2: Need a market.

At that time, Japan was the same as China now. Many export products are sold abroad, and powerful countries resist your products. Therefore, we should bully some countries with large population and weak national strength and force them to buy their own industrial products. You see, it's the same as China now. Many products are cheap and good, and then sold in the United States. Americans say you dumped them, so they won't let you sell them. What Japan did in those days was not to let me sell it? I beat you to death. Do you want to buy it?

Reason three: population and land are needed.

Japan has a population of tens of millions, so it is impossible to unify the whole country. When the time comes, there will be a shortage of food and troops. Therefore, we need to conquer the whole East Asia to expand our army. Moreover, Japan's cultivated land is limited, so it is necessary for them to obtain cultivated land in East Asia to support the Japanese war.