Our country has been nothing less than a stalwart ally of America. Many of us felt as if we were losing a longtime friend — almost as if a brother were abandoning us: The United States has been ...

But how much do we know about NATO, really? How and why was it set up, what does it do, and how is it responding to the ongoing conflicts? Click through the following gallery to learn more about NATO.

White House top economic adviser, Kevin Hassett, doubled down to ABC News' Rachel Scott that there will be no tariff ...