In January 2014, 273,968 Americans signed a White House petition to deport Justin Bieber. The White House was legally required to respond. 19 months later, he released the first #1 single of his career. Here's the stat almost nobody knows. Bieber had five #1 albums before his 18th birthday, a record no artist in history had touched. But he'd never had a #1 single. "Baby" peaked at #5. "Boyfriend" stalled at #2. The biggest pop star on the planet couldn't get a song to the top of the…