Amajor reason for the tremendous growth of the u. s. economy after world war ii was

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.

equal area projections

equal-area projection. a projection in which regions on the earth's surface that are of equal area are represented as equal.