How are the rights or the freedoms of Americans limited?

As Americans we have civil liberties and civil rights. Protection of civil liberties and civil rights is perhaps one of the most fundamental political value in American society. Liberties and rights are different but in both words appear in the Declaration of Independence and the Bill of Rights. Distinction between the two has already been blurred and today the concepts are often used interchangeably. However they do refer to kinds of guaranteed protection. Civil liberties are protections against government. These rights are limited when government takes away those unknowingly.