The answer is B. It was based off the moral principles.
Department of Homeland Security
It would be an "effective secondary source document" that best describes a chart developed 20 years after a historical event, since the information as had time to "settle"--although of course this doesn't automatically mean that the chart is "effective". hope this helps :)
Answer:
the Great Plains
Explanation:
Throughout the region there are many farms dedicated to agriculture and farming. It is also home to vast amounts of oil, gas, and coal.