Which nation built the fewest tanks?

Do humans change their physical environment to adapt or do humans adapt themselves to their physical environment?

At the time of the brown v. board of education decision,schools were segregated everywhere in the country.several states had laws requiring segregated schools.schools in nearly every state has been desegregated.segregation was common in the north, but not in the south.

What evidence is there in this document that the policy was a good idea?