Why the US Needs a ‘Secure Border With a Wide Gate’

Which part of the graph below do the GOP border warriors not understand? To wit, after growing by 1.9% per annum between 1972 and 2008, the growth rate of the prime-age US labor force (age 25-54) has decelerated to, well, 0.03% during the last 14 years.

At the same time, you do not need to be an economic historian to recognize that fully half of the GDP growth during modern times has been due to more workers and more labor hours supplied to the economy. So if labor supply growth has gone to zer...