The correct answer is shipping of goods to and from Europe.
The Embargo Act of 1807 was a law signed into place by US President Thomas Jefferson. At this time, Britain and France were at war in Europe and America was negatively impacted by its trade with these two countries. Both countries seized American ships and seamen. Along with this, both Britain and France were trying to pass laws prohibiting the US from trading with any of their enemies. This rise in tension between the two countries and the American military/merchants facing constant harassment when trading resulted in Congress creating a law that ended American traded in all foreign ports for the foreseeable future.