In our fourth of a series on American commerce, a look at three instances of when U.S. commerce was stopped, for a variety of reasons.  The embargo of 1807 is an important part of the Presidency of Thomas Jefferson, not often examined in detailed compared to other events. It brought serious economic problems, but was held up by Jefferson as an experiment by a peaceful power. We also examine his Treasury Secretary Gallatin, who had to implement the plan.Learn more about your ad choices. Visit megaphone.fm/adchoices