There has always been difference in the views of liberals and conservatives for the last so many years in the american history.

liberal. Not limited to or by established, traditional, orthodox, or authoritarian attitudes, views, or dogmas; free from bigotry.

Conservative. Favoring traditional views and values; tending to oppose change.

Whats the major difference? Why we call liberals as "liberal" and conservatives as "conservative"?

Healthy discussion please...