From the United States, I was quarantined in Beijing. Do I have to be quarantined when I go back to Guangzhou?

Look at the requirements of the local epidemic prevention policy in Guangzhou. After the quarantine in Beijing is over, call the local epidemic prevention department before returning to Guangzhou. Just do it according to the requirements of the epidemic prevention department, and call the neighborhood Committee where you live to see what requirements the neighborhood Committee has. Otherwise, you may not be able to enter the community, or the health code will pop up. This needs the neighborhood Committee to help you.