What does the immigration restriction wall mean. Talk about China and other countries. How does it affect those countries?

The immigration restriction wall means the intangible barrier erected in order to filter the unwanted immigrants coming to the United States by implementing reasonable restrictions.

It affects China and other countries in the following ways:

China being the country where the most immigrants come to the US from, it causes China the most loss. It restricts the non-meritorious Chinese and other immigrants willing to move to the United States in search of better working opportunities. It causes the resources in countries like China and India to be exploited more and more as the non-meritorious population is not allowed to immigrate to the US.