Would a wall be effective in preventing illegal immigration from Mexico to the US.?

Trump's border wall will help because there are still hundreds of thousands of immigrants coming into our country. It has nothing to do with being scared of "non-white people" my family is Mexican we imigrated here legally the right way. It makes us mad that so many people will not wait like my family did so many years ago. If you are going to come you must come legally or not at all. We cannot contain herds of people that is why America has protocalls that they follow, just like every other country in the world. In other countries, it is even harder to get into them. I do not agree with President Trump on a lot of things he says and does, but I do believe his is right about the wall, and if his comments on Twitter repel people so be it. I have not heard of the immigrants going back to Mexico or their respective country, actually I have heard the opposite a caravan, several caravans!