Evaluate why Dahl chose to actually end the story in the film version rather than leave it a cliffhanger as
originally told in his short story?

why

Explanation:

I don't know why that is necessarily happening

The whole intercourse between the United States and this Nation, is, by our Constitution and laws, vested in the Government of the United States. Georgia, however, ignored the decision, keeping Worcester and the other missionaries in prison. Eventually, they were granted a pardon and were released in 1833. The US government tried to purchase Cherokee territory for a steep price.

Explanation: In an opinion delivered by Chief Justice John Marshall, the Court held that the Georgia act, under which Worcester was prosecuted, violated the Constitution, treaties, and laws of the United States. On appeal their case reached the Supreme Court as Worcester v. Georgia (1832), and the Court held that the Cherokee Nation was "a distinct political community" within which Georgia law had no force. The Georgia law was therefore unconstitutional. ... A leading attorney who argued many famous cases in the Supreme Court. Pres. Andrew Jackson declined to enforce the Supreme Court's decision, thus allowing states to enact further legislation damaging to the tribes. The U.S. government began forcing the Cherokee off their land in 1838.