Why don't Guangdong, Hong Kong and Macao use Mandarin as widely as mainland Taiwan Province Province?

First of all, I want to correct the "building information area" in LS. Cantonese is defined as a language by the United Nations, and is the language of China just like Mandarin, not just a dialect.

Cantonese has become a language because many overseas Chinese speak Cantonese except Guangdong, Hong Kong and Macao, which is attributed to the immigration tide in Hong Kong in the 1970s and 1980s.

Due to the popularization campaign of China government, it has actually succeeded in reducing the usage rate of local mother tongue in all parts of the country, including Guangdong. In the 1980s and 1990s, primary schools promoted Putonghua teaching, and with the influx of migrants, teachers had to pass the Putonghua proficiency test and teach in Putonghua. So far, it has not been taught in primary and secondary schools, and even in kindergartens, Mandarin is taught, which leads to the fact that children in kindergartens now speak Mandarin with their parents when they go home.

Mandarin is not an independent subject, so LZ's statement that he will stop learning Mandarin after junior high school is not valid, because the classroom itself is taught in Mandarin. As for outside the classroom, there is nothing wrong with us speaking our mother tongue.