At the end of this "journey", although I have read conflicting opinions, I always remain of my idea: building barriers is a way to avoid problems and not solve them.
I put myself in Trump's shoes and I think that if the real reason was illegal drug trafficking, it would be good to check the entrances, but not limit or eliminate them.
But I also put myself in the Mexican shoes and I think that building a wall has unfounded motivations and would only lead to negative consequences, because they would have no more chance of looking for a job in America and poverty in Mexico will continue and increase. But this is Trump's idea: to affirm America's superiority in all fields, and to me it's wrong.
In my opinion there should be more cooperation and more controls to avoid negative situations.
In conclusion, I am against the construction of the wall.