Which developed countries explicitly prohibit immigration now?

According to the past colonies, most of the central and eastern parts of the United States are descendants of Britain, France, the Netherlands, Ireland, Spain and other western European countries, while Florida in the southeast is dominated by Spanish and Portuguese descendants, who all speak Spanish and many Italians. Because the development of the western regions was relatively late and there were not many early French immigrants, it was quite complicated. Among the old immigrants, there are also many descendants of Germans, Russians and Slavs. Asians and Africans are mostly trafficked in the form of early labor or slaves. New immigrants will be everywhere.