The Ming dynasty only closed its doors once in Jiajing, just to prevent the rampant Japanese pirates at that time. When Qin Long, his son, solved the piracy problem, the customs naturally opened. Don't think that the Ming dynasty closed its doors like the Qing dynasty, but it was very open and free at the end of the Ming dynasty! Want to know specific problems, you can go to Baidu Ming Dynasty, where there are many people with strong historical knowledge!