The President of the United States, Donald J. Trump has declared a state of national emergency in order to carry out one of his great campaign promises: to build a huge wall along the entire border between the United States and Mexico, a wall that is estimated to cost tens of billions of dollars.  But why is this wall so controversial? Why oppose him? Is it really going to make the United States a safer place, as Donald Trump promises? In this video, we’ll answer these and other questions so you can better understand what is happening and what consequences the Donald Trump Wall may have.