NATO has helped keep the peace in the Northern Hemisphere for more than half a century. Donald Trump is threatening to dismantle it. Read more from Vox's Zack Beauchamp: http://www.vox.com/2016/7/21/12247074/donald-trump-nato-war Subscribe to our channel! http://goo.gl/0bsAjO Vox.com is a news website that helps you cut through the noise and understand what's really driving the events in the headlines. Check out http://www.vox.com to get up to speed on everything from Kurdistan to the Kim Kardashian app. Check out our full video catalog: http://goo.gl/IZONyE Follow Vox on Twitter: http://goo.gl/XFrZ5H Or on Facebook: http://goo.gl/U2g06o