She mentions wizards from France, Belgium and Eastern Europe, even Africa, but never North or South America.
Goblet of Fire. A group of middle-aged withes are hanging out under the banner "The Salem Witches Institute," or something of that nature. Also, one of the older Weasley boys had a penpal who was, IINM, from Peru or Brazil.
But, by and large, yes...the books lean so far toward the Old World that they practically tip over.
Now that you mention it, Draco used Peruvian Instant Darkness powder twice in “Half-Blood Prince.”