During the War of Resistance Against Japan, the Ambitions of the Japanese Army increased dramatically, and for a time occupied most of the Pacific, and almost all of China's coastal cities fell under its iron hooves, even the British colony of Hong Kong and the French colony of Vietnam.
Interestingly, China has a city of bullets, but the Japanese army has never dared to send a soldier to occupy it.
This is the undefended Portuguese colony of Macau, China.
Why didn't the Japanese army dare to occupy Macau?
Many people are confused.
It turned out that in the early 16th century, Portuguese colonists invaded Brazil in South America. Brazil is vast, however, sparsely populated and has no ethnic groups other than the indigenous population. In order to establish the Brazilian state, the Portuguese immigrated to Brazil in large numbers.
Brazil is sparsely populated, and Japan, which is partial to Asia, has a large number of people and a small amount of land, and lacks land. In the 1580s, the Japanese government made a pact with the Portuguese-occupied state of Brazil to relocate a group of Japanese from the main island of Japan to Brazil every year in order to reduce the population burden in Japan. As a result, by the outbreak of World War II, the number of Japanese emigrants to Brazil had reached 3 million.
After the Lugou Bridge Incident in 1937, the Japanese army invaded and occupied China on a large scale. The Portuguese government knew Japan's great ambitions for China, and seeing that the Kuomintang army was gradually defeated, it was worried that the Japanese army would occupy Macao after occupying Guangzhou and other places, so it sent a note to the Japanese government that if Japan occupied Macao by force, the Brazilian government would repatriate all 3 million Japanese overseas Chinese who had moved to the country to Japan.
It was precisely this note that made the Japanese side have to be scrupulous.
It is precisely because of this origin in the history of Portugal and Japan that after the Japanese army occupied Guangzhou and Hong Kong, they did not dare to garrison Macao, and Macao was thus able to avoid a bloody massacre of the city.