Is Mahasai County in Ganmeng Province of Laos from China?

Mahasai County, Ganmeng Province, Laos is not China's. Details are as follows:

Mahasai County, Ganmeng Province, Laos is adjacent to Yunnan, China, and many China people work and live in Laos. They belong to the people of China. I also know that there are some Lao people in China who are married to China, but they are not from China, and they still hold Lao passports. They need to go to the public security organs to apply for a residence visa for a certain period of time before they can live in China. Children born can go to China for protection and enjoy all the treatment of the people. In fact, I hope the country can give these foreign brides green cards and join China as soon as possible.