What's the use of building a wall on the border in the United States?

In order to prevent illegal immigrants from Central and South America from entering the United States, but also to keep drug trafficking and smuggling gangs out of the border of the United States.

This border wall was built unilaterally by the United States. Trump invested tens of billions of dollars in it and claimed that it was the strongest artificial fence in American history.

However, this fence did not win glory for Trump's face, but made him lose face. Smuggling tunnels are often found in this so-called unbreakable border wall, so the border between the United States and Mexico looks like a sieve that needs to be filled everywhere.

The relevant departments of the United States also issued a notice that a 400-meter-long smuggling tunnel was discovered at the border, and its construction technology was amazing.

In this tunnel, there is not only a ventilation system for exchanging air, but also corresponding facilities such as railways and circuits, which can be described as complete. There have been many loopholes in law enforcement on the US-Mexico border for so many years. Due to the long distance of the border, it is difficult for relevant departments to comprehensively monitor every corner. Mexican drug dealers and smugglers, including those who want to immigrate illegally, all entered the United States from here.

It is reported that this smuggling tunnel is 400 meters long and its exit is difficult to find. This discovery by law enforcement officers was purely accidental.