Protectionism built America. Consult your history books. We were very protectionist until 1913 when the Federal Reserve was established and the Federal income tax was instituted. Connect the dots. You are libertarian with your free trade slant so you must at least be very suspect of The Fed Resreve and the Income tax coming in at the same time.
When tariffs got diminished we needed an Income Tax to provide revenues for the Federal Govt, Historically the Federal Government ran on income from tariffs and to a lesser extent alcohol and tobacco taxes
For your edification:
http://www.freerepublic.com/focus/news/3166241/posts?page=76#76
Also for your edification, I am not a libertarian.