It didn’t before? I remember crossing the border from Canada to the US after 9/11 but before you had to have a passport (a driver’s license and birth certificate were sufficient) and I was asked a series of questions. The questions included a lot of family stuff, like “where does your father work?” but they also included “what is your girlfriend’s birthday,” which I found odd because I was dating a lot and didn’t have a steady girlfriend at the time. I’m not bragging here, but it took me three name/birthday combinations to guess the one the border agent had on his terminal screen.