The hurdles to building a border wall

The building of a border-length wall between the United States and Mexico is a campaign promise that US President Donald Trump continues to nurture. But the construction of such an edifice is no small matter, assuming Congress would even approve or agree to fund the endeavor in the first place. Not only must the Trump administration deal with internal complications — legal opposition, issues of land ownership and physical geography — but there is also the matter of US-Mexico relations and the fluid, adaptive nature of the migrant flow from South America.

Analysis