Sort into groups without any hints - II

1.) There are 5, groups with 7, 6, 5, 4, and 3 places (countries / cities) each. 2.) No hints are given except for the number of places in each group. 3.) Guess the common attribute based on the number of places in the group. 4.) Sort each place into its correct group 5.) Places falling under one group will not fall under any other group 6.) Conversely, all Places fall under some group