Both of your major political parties have been slowly eroding your freedoms for decades and you've allowed yourself to get too distracted by partisan politics to really care. You've allowed yourself to become ignorant of your own government and you only pay attention to it when the economy sucks or your own personal living situation is otherwise compromised. The executive branch continues to usurp power little by little while everyone is focused on arguing issues by party affiliation. Both parties make each other into an enemy for purposes of controlling the population. Go back and read Orwell's 1984 for that lesson.
As a friend of mine used to say, only a dictatorship could run a country as large as the US and so far we're doing a pretty good job of proving him right.