Americans eat way more than they used to
As the FDA tactfully puts it, "What and how much people eat and drink has changed since the last serving size requirements were published in 1993." That belt's fitting a little bit tighter than it did in the early '90s, America! Lolz, you got fat. Basically, the serving size jumped up, because who's going to eat 200 calories of mint chocolate chip ice cream? There's still approximately 123 minutes of Jerry Maguire left once you finish.
Another component to the serving-size change is that companies can't get away with claiming there are 17 servings in a 40oz jug of soda, or whatever people buy in Texas now. If a food or drink is sold in a package meant to be consumed by one person, it equals one serving.