In the end of the major case of Brown Vs. Board of Education,
the Supreme Court ruled that racial segregation in public education facilities was UNCONSTITUTIONAL. This being said, the answer to your question, is D.
It struck down segregation laws as unconstitutional.
It was counting on the fact that it was to large for the union to conquer.
Number 26 is b
Number 27 is d
Hope this helps a little
I would say B because a surplus of food means that there is a lot of food to go around, meaning that people wouldn't have to worry about finding food all the time. So, they could go specialize in other jobs and skills, leading away from a food-centered civilization