Hate to tell you you're wrong. But you're wrong! Muahahhaha.
It originated from the hardcore punk movement in Washington D.C. Yes, we're not talking about true punk like Ramones, but we're talking about the newer punk.
There are a lot of bands out there that blend punk and emo. Senses Fail is one I can think off the top of my head. There's much more.
Heck My Chemical Romance is a big one that is punk and emo. They have a real distinct style derived out of it, kind of operatic theater music, but I can see both the punk and emo in it.

