To put it simply, a hundred years ago, South America launched an independence movement, and countries basically achieved formal independence.

But South American countries, especially Brazil, are short of population and labor.

So at that time, South American countries not only introduced measures to encourage immigrants from all countries, but also invited them to send immigrants to live.

Among them is Japan. At that time, the population of Japan was already quite large, and the contradiction between man and land was quite prominent. So after receiving the invitation, I was very happy to send a large number of immigrants. This is the origin of a large number of Japanese expatriates in South America.

Moreover, why were the eastern and southern parts of China, including Hongkong, occupied during World War II, except Macau? Actually, it has something to do with this

Because Brazil was still largely controlled by Portugal at that time, and Portugal threatened Japan. If he occupied Macao, they would repatriate all the Japanese in Brazil, which frightened the Japanese and saved Macao from occupation.

The above is what I know before, I hope it will help you.