Consumer rationing was used during world war ii
as a way to
(1) increase exploration for natural resources
(2) limit supplies of weapons to american allies
(3) draft men into the armed forces
(4) ensure that the military had essential
materials

Consumer rationing was used during World War II as a way to "(4) ensure that the military had essential materials" which were much needed for the effort in Europe. 

Contributing factors  leading  to the harlem renaissance were the great migration of african americans to northern cities, which concentratedambitious  people in places where they could encourage each  other, and the first world war, which had created new industrial work opportunities for tens of thousands of people.