It was a relatively quiet patch in the warring , but a quick look at Wikipedia shows a fair few conflicts during that period including fighting internally against native Americans. Civil unrest with military action, landing troops to protect foreign interests which included shelling and shooting. It all depends how you define armed conflict. I'd say soldiers and guns = armed conflict. Others would say that a declaration of war was required. Have a look at this Wikipedia list of military actions - it may not be outright war, but it wasn't peace. http://en.m.wikipedia.org/wiki/Timeline_of_United_States_mil...