Freedom???
This is a country that runs a concentration camp and has laws that allow for arrest and imprisonment without trial and torture.
Do you believe that?
If you're correct, then look again at this part of the quote:
It is not ours by inheritance; it must be fought for and defended constantly by each generation, for it comes only once to a people.
If we have lost freedom, it is because we haven't fought for and defended it constantly.
I don't believe that we are running "concentration camps", but we have no doubt lost some of our liberties due to the unwillingness to fight for and defend it. I'd look at asset forfeiture and the Patriot act as places to start fighting.