27 Iconic Moments in One Direction History

What happened: One Direction toured the US as the opening act for Big Time Rush.

Why this is important: The first time One Direction toured the US, it was as Big Time Rush's opening act for their small tour. I know, who is Big Time Rush? I don't know either, so it's amazing that One Direction, who just three years later were headlining the largest stadiums in the world, opened for them once upon a time.