I believe it is shifting cultivation
"<span>D. His efforts to end poverty were hurt by the enormous cost of the war in Vietnam" is true. There were also political push-backs from opponents, however. </span>
For the full article, see Delian League. Delian League , Confederacy of ancient Greek states led by Athens and based on the island of Delos. Founded in 478 bc to combat Persia, its members included Aegean states and islands; Athens supplied commanders and assessed tributes of ships or money.