Generally these are countries where one of the following is true: 1. The ID in question is nationally compulsory to carry out most day-to-day tasks, and so no

Generally these are countries where one of the following is true: 1. The ID in question is nationally compulsory to carry out most day-to-day tasks, and so no one is disenfranchised by having to show it. In the US, on the other hand, there are lots of people without any form of ID card 2. The country has a history of large-scale in-person voter fraud. In Mexico, both of these things happen to be the case.