Which national park contains three distinct ecosystems?

Olympic National Park contains three distinct ecosystems.

Explanation:

Olympic National Park which covers 1 million acres provides 3 different ecosystems such as rugged Pacific coastline, glaciated mountains, and lush temperate forests which has diversified flora and fauna for nature explorers.

Washington State’s Olympic National Park safeguards human history for years with vast wilderness, and ecosystems, like rain-forests and glacier-capped mountains.

Actually in 1909, it was set up as a national monument, later President Roosevelt in 1938 re-assigned it as Olympic National Park and it begin to be an International Reserve of Biosphere, and after 1981 was approved as one of the World Heritage Site.

i think the answer to your question is: settlement of the interior and economic growth. ( ^_^)／