During buchanan's presidency, the idea of popular sovereignty grew, which is when states have a right to choose whether or not to adopt slavery. this was because of the kansas-nebraska act, which called for popular sovereignty in those states.

most people now work in jobs where they do one  kind  of work; they are carpenters, bankers, cooks, mechanics, and so forth. likewise, most  businesses produce  only certainkinds  of  goods  or  services, such as cars, tacos, or gardening  services. this feature of  production  is known as specialization.