(Being pedantic here) A couple US states technically use proportional representation in the apportionment of electors in a presidential election (Nebraska and Maine), although it's of course dubious if an elector actually counts as a representative, given how ephemeral they are.
If english is not your first language the mistake is harder to avoid. In my native tongue Colombia is called Kolumbija so going to english you can see where the confusion may lie.
As someone from Lithuania, you have no idea how crazy our politics can get and how heavily our democracy relies on a rule that a party, in order to get into the parliament, must get at least 5% of the total votes.