The Japanese once occupied more than half of China. Why didn't it dare to invade Macao?

It turns out that in the 1930s of 16, Portugal sent an expedition to establish a colony in sparsely populated Brazil, and it has been suffering from no development. The Portuguese once expressed their willingness to welcome immigrants to the Qing Dynasty, and hoped that China people would immigrate to Brazil to jointly develop this country with the largest area in South America. Due to the arrogance and closed-door policy of the Qing government, the Qing government did not ask Portugal. But when Japan got the news, it agreed, promised to immigrate to Brazil in large numbers, and exported a large number of labor to Brazil one after another. By the beginning of World War II, more than three million Japanese had emigrated to Brazil.

Faced with Japan's wanton aggression in World War II, Portuguese colonists were very nervous and worried that Japan would invade Macao, so they asked Brazil to send a note to Japan, which wrote: "If the Japanese invade Macao by force, Brazil will expel all Japanese overseas Chinese to their own countries." This deterrent really worked, and the Japanese broke out in a cold sweat. If 3 million people are swept out of the house together and rushed back to their hometown of Japan, it will not only cause chaos, but also cause a lot of trouble. Therefore, the timid Japanese gave in to the pressure and did not dare to attack Macao from beginning to end in World War II.

At that time, Macao was a paradise for spies, and Japan could get information from Britain and the United States through Macao.