As is Canada. I've made numerous passport-free, multi-thousand mile road trips, in two different countries that each span a land mass larger than the entirety of western Europe. (33 states and 6 provinces -- I'm missing the far-north, the deep south, pieces of the eastern seaboard, and Hawaii.)

Country-count isn't a particularly great metric for how widely traveled you are, unless you live in an area of the world where it seems you can fit a dozen countries on the head of a pin.