Maybe the concepts of freedom are personal, subjective even, and the only measure of freedom is whether you can be left to live as you wish, think and say what you want, while also being able to realise your dreams.
The last one is complex. If you are retarded, are you less free, or does the retardation not allow you to see your limitations, and thus you really are free? lol
That's why I say freedom is subjective in nature. Sure the less 'legal' or 'social' limitations on you is one measure, but I think it goes beyond that.
P.S. None of this is to say America is less free than X or Y ( unless they think it is themselves ofc )