Podcast:Throughline Published On: Thu Mar 21 2019 Description: In February, President Trump declared a national emergency at the US-Mexico border. Last year, he ordered thousands of National Guard troops to the border. Is this the first time an American president has responded with this level of force? In this week's episode, the history of militarization at the U.S.-Mexico border.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy