Its not me who says that the athenians were a minority in their own land,
Pericles instituted laws which demanded that both parents be Athenian citizens. So, in reality, the great democracy of Periclean Athens was in reality only a very small minority of the people living in Athens.

Every citizen on an average had 3 slaves. these slaves didnt enjoy the rights of a normal citizen - hence we have a majority of non athenians to athenians (BORN FREE to be precise)