C ~ They divided the land into 36 square-mile parcels
Answer:
The Korean War started.
Explanation:
On <u><em>June 25, 1950, North Korean forces surprised the South Korean army</em></u> (and the small U.S. force stationed in the country), and quickly headed toward the capital city of Seoul.
Mark me brainliest if I helped:D
The answer is b: the native people lacked natural immunities