Add a letter, whether same or different, to each of the seven sets of letters below, so that each set can be anagrammed into the name of a country.

1) I  U  S  N  T  A
2) I  U  S  A  T  A
3) B  E  N  O  N  A
4) R  E  D  K  M  N
5) L  A  S  G  N  E
6) C  R  E  D  O  U
7) I  N  R  I  E  A

Bonus Question: The seven letters, which are added, can be together anagrammed into the name of a country. What is it?

***Adapted from a problem appearing in "Test of Reasoning 4" by Philip J. Carter and Ken A. Russell.