The most noticeable after effects of the Korean War include rising tension during the Cold War, human casualties and the division of families due to the war. The Korean War was fought by North and South Korea from 1950-1953. Both sides had support from other countries.
Cold War tensions:
A desire to prevent the spread of communism is what caused the United States to provide aid to South Korea. Following the war, North Korea remained firmly under communist control.
It is estimated that the United States had more than 40,000 casualties during the Korean War, while South Korea had 400,000 casualties. North Korean estimates for war casualties are around 400,000 as well.
Division of families:
Many civilians fled their homes in North Korea at the start of the war, leaving behind everything that they owned, and in some cases, other family members. In the 21st century, communications and travel between North and South Korea is still closely restricted.