You need 15 points to make a champion.
The country is split into divisions based on the # of chihuahuas in that chunk of the country, and based on that amount, you then have to beat certain #'s of dogs to win 1, 2, 3 or more points. 3 or more points is considered a major.
Points start being given at winner's dog/winner's bitch, best of breed, best in class, etc. We don't get points at all if we get second or third.
You need 2 major wins under 2 different judges and wins under at least 3 different judges to get a major, but points must total 15 or more points no matter what, so most people try to finish their dog with 3 major wins of 4 points or so, and get a few side points at smaller shows. Its unlikely someone will finish a dog with only 2 majors,because that's less than 1/2 the points needed for a championship, and it would get kinda expensive to finish it. To get a 4 or 5 point major in any division it means you are beating at least 10-12 other dogs.
I would not say it is easier to win a championship over here, although I bet our views will disagree. We do have have more dogs, and more shows, and more chances to win, so in that sense, yes, it is easier to win.