America First is best known as the slogan and foreign policy advocated by the America First Committee, a non-interventionist pressure group against the American entry into World War II, which emphasized American nationalism and unilateralism in international relations.
I would say 30,000 cause all the next developments were from the 1860's forward and that is when huge growth happened, after 1860.
They were considered still colony's of great Britain but they classified themselves as free states.
