Why this commercial was touching

I traced the 84 Lumber commercial because it showed a little girl who was leaving Mexico and was going to America. The little girl then started to collect things along the way and once her and her mom reach the border, they find a tall wall that can't be climbed. It was like a door for them closed because they traveled far to be able to go over to America. When the man finished building he left a door that was wooden door there so that people could cross. It was touching for me i think this is the first commercial that got to me.

https://m.youtube.com/watch?v=nPo2B-vjZ28