The locations of Federal Reserve District boundaries, and of the Banks within the Districts, were determined mostly by the geographic distribution of the U.S. population at the time the Federal Reserve System was created (1913), to accommodate local needs.
Mr Trump claims the total cost of the wall will be $10bn (Â£7.5bn) to $12bn. But estimates from fact checkers and engineers seem to be universally higher. Senate Majority Leader Mitch McConnell estimated it will cost between $12-15bn, as he addressed reporters at a Republican conference in Philadelphia.
Trump has vowed to force Mexico to pay for the border wall and said Tuesday on MSNBC that the hefty $8 billion price tag is a tiny fraction of the money that we lose with Mexico on trade. The wall is probably $8 billion, which is a tiny fraction of the money that we lose with Mexico.