The phrase "for cutting off our trade with all parts of the world" would most likely reference a law passed because of which event?

The answer is the American Revolutionary War, which was fought between Great Britain and its Thirteen Colonies between 1775 and 1783. This phrase is part of the United States Declaration of Independence (it can be found in the section "Abuses of King George III"), which was adopted on July 4, 1776 in order to proclaim that, from that moment on, the Thirteen Colonies, which by then had been at war against Great Britain for over a year, would consider themselves as thirteen independent sovereign states.    

demand is the need and oportunity to buy a given good or service.