One-hundred seventy years ago today, the world’s largest, secure border came into being.
One-hundred seventy years ago today, the world’s largest, secure border came into being. On June 15, 1846, the United States and Great Britain established the boundary line between the U.S. and Canada. Now, these neighbors are their largest trading partners and closest allies, even sharing joint air defense. The relationship proves that working across borders can lead to security and prosperity.
http://www.history.com/this-day-in-history/u-s-canadian-border-established