Answer:
U.S. troops aided South Korea with support from the U.N.
Explanation:
The US troops helped with the defense of Pusan, and injected an invasion force into Incheon, which effectively cut off all supplies to the North Korean Army, and led to a complete rout to the border of China.
<span> Years: 1580 to 1640 is when they suffered</span>
Answer: A
Explanation: significantly weakened Japanese and US land troops in the region.