Pretty much everyone in South America used them at one time, although to a limited degree and limited time frame in Brazil, where French influence was much more pronounced. Chile has a very Prussian military heritage, started by Prussian instructors, they still have M 35 pattern coal scuttle helmets for parade wear. Oddly enough for a country largely composed of Italians, the same fetish for German millinery exists. Then again, they killed 30,000 of their own people in the '70s so not just a Teutonic fashion sense prevails.
I saw pickelhaubes in use by the Colombian Presidential Guard battalion outside the Presidential Palace in Bogota. I'll see if I can post a photo. Very Prussian looking.