What was the effect of the Stamp Act on American liberty?

There were at least two effects of the Stamp Act on
American liberty.  One effect was on the American liberty to govern themselves while the
other was on their liberty to be tried by a jury of their
peers.

The Stamp Act, of course, was passed by a Parliament
that did not have American representatives.  Colonial assemblies were not consulted. 
This took away from the liberty that Americans felt they had to govern
themselves.

Secondly, the Stamp Act took jurisdiction over
cases arising under it and gave that jurisdiction to vice-admiralty courts.  Cases in
these courts were heard by judges only, without juries.  This took away the liberty of
trial by jury and set up a system where rights and liberties were at the mercy of the
government only.