The answer is, "B", "Crops".
Prayer, examples the blessing and daily prayers
This achievement was irrigation; possibly the first in the world.
Irrigation refers to a system of water canals, usually from a river or another natural water source, that lead to farming fields that provide water to those fields, which they would otherwise not have (or not as much).
Answer:
Dred Scott v. Sanford in 1857
Explanation:
The ruling said that all African Americans were not U.S. citizens. Dred Scott tried to sue so he could have his freedom.