What is the difference between the business of the US Consulate in Beijing and that of the US Consulate in Guangzhou? Do I have to go to Guangzhou with an immigrant visa?

The US Embassy in Beijing is responsible for all American affairs in China and where to apply for immigrant visas. However, for the convenience of business, the American embassy has set up consulates in different cities, which accept all kinds of business in provinces and regions near the city. The US Consulate in Guangzhou mainly accepts the business of several provinces and regions in South China, which means that if you are in this jurisdiction, you'd better apply for immigration here. But you can also go to the Beijing Embassy, but the speed is much slower, because they have to feedback your information to the local authorities for verification.