There always have been and there always will be restrictions who's allowed to vote. The question is not if some persons are excluded but only who is. Some former restrictions look funny to us now, like e.g. women not being allowed to vote (I believe they are now allowed to vote all over Europe; since 1990) or men not carrying a weapon (rural Switzwerland, as recent as twenty years ago).

Some of today's restrictions will look funny in 100 years. For instance, the right to vote relying on provenance and not residence bewteen countries: In 100 years nobody will understand why a born British living and earning his bread in Germany since 20 years has not had the right to vote in Germany.

As for invaders not allowing original inhabitants to vote, there has been the opposite case at least once: Estonia after 1990 has not allowed descendants of the Russian invaders of 1939 (?) to vote.

Wolfgang