President Trump’s “Great Wall” ignores a key reason why desperate Mexicans and Central Americans flee north – the history of U.S. military and economic intervention that has created poverty and repression, notes William Blum.

Instead of building a “Great Wall” on the Mexican border, President Trump might find it so much cheaper, so much easier, so much more humane, so much more popular — if the U.S. government would just stop overthrowing or destabilizing governments south of the border.