Long ago, a war happened in Korea. 

Long ago, Korea was split into two parts. 
In 1950, the north invaded the south. This started a big war. Many people had to leave their homes. 
Other lands came to help the south. Many groups joined together to fight. This helped the south stay safe. 
After a long time, the fighting stopped. Leaders signed a paper to end the war. They made a special zone between the lands. This kept the two parts apart.
Even today, the two sides are still split. People remember this time in history.
After World War II ended in 1945, Korea was split in two. 
On June 25, 1950, North Korea invaded the South. 

The fighting was very hard and lasted for years. Many cities were destroyed by bombs. 

The Korean War was a major conflict on the Korean Peninsula. It began on June 25, 1950, and lasted until July 27, 1953. This war was part of the Cold War era. It was a fight between two different sides. North Korea was supported by China and the Soviet Union. South Korea was supported by the United Nations. The United States led the United Nations Command. This war was very hard for people living there. 
The war moved back and forth across the land. First, North Korean troops invaded the south. They captured the city of Seoul very quickly. By August, South Korean forces were pushed back to a small area. This area was called the Pusan Perimeter. Then, United Nations forces landed at Inchon to fight back. They retook Seoul and moved into North Korea. Soon, Chinese forces crossed the Yalu River to help the North. The fighting then became a long struggle for control. 
To understand this war, we must look at the past. Before 1945, Japan ruled Korea as a colony. After World War II ended, the land was divided. The Soviet Union and the United States split Korea at the 38th parallel. They wanted to plan for a free, independent country. However, political disagreements prevented this from happening easily. In 1948, two separate governments were formed. Kim Il Sung led the North, and Syngman Rhee led the South. 
Many important facts come from this three-year struggle. The war caused about 1 million military deaths. It was also very sad for regular people. Between 1.5 and 3 million civilians were killed. Many major cities in the North were destroyed by bombs. The United Nations sent troops from 21 different countries. The United States provided about 90% of those soldiers. President Harry S. Truman ordered U.S. forces to help the South. 
Even though the fighting stopped, the division remains today. On July 27, 1953, leaders signed an armistice. An armistice is an agreement to stop fighting. It created a 4-kilometer wide area called the DMZ. This is the Demilitarized Zone. It sits along the old frontline to keep the sides apart. No formal peace treaty was ever signed between the nations. Because of this, the conflict is often called a "frozen conflict." 
The Korean War was an armed conflict on the Korean Peninsula. It lasted from June 25, 1950, to July 27, 1953. This war was a major proxy war during the Cold War. A proxy war happens when larger powers support opposing sides in a smaller conflict. North Korea was supported by China and the Soviet Union. South Korea was supported by the United Nations (UN) Command. The United States led this international force. 
To understand the war, we must look at the history of Korea. From 1910 to 1945, Korea was a colony of the Empire of Japan. After World War II ended in 1945, the country was divided. Two occupation zones were created at the 38th parallel. The Soviet Union controlled the north, and the United States controlled the south. This line was chosen by U.S. officials to include the capital, Seoul, in the American zone. 
Political disagreements prevented a single, unified government from forming. In 1948, two separate states were established. The Democratic People's Republic of Korea (North Korea) was led by Kim Il Sung. The Republic of Korea (South Korea) was led by Syngman Rhee. Both leaders claimed to be the only legitimate government for all of Korea. Tensions grew along the border for two years before the fighting began. 
On June 25, 1950, the Korean People's Army (KPA) invaded the south. The KPA was trained and equipped by the Soviet Union. The UN Security Council authorized military force to help South Korea. This was the first time the UN used such power under its Charter. The United States provided about 90% of the military personnel. In total, 21 different countries sent forces to support the South. 
The war moved through several intense stages. First, North Korean troops captured Seoul on June 28, 1950. By August, South Korean and UN forces were pushed back to the Pusan Perimeter. On September 15, UN forces landed at Inchon to cut off enemy supply lines. They recaptured Seoul and moved into North Korea by October. However, the Chinese People's Volunteer Army crossed the Yalu River to join the war. This caused UN forces to retreat in December 1950. 
After the Chinese intervention, the war became a struggle of attrition. This means both sides fought to wear down the other's strength. UN forces retook territory near the 38th parallel after several offensives. Armistice negotiations began in July 1951, but fighting continued for two more years. During this time, the UN Command conducted heavy carpet bombing in the north. This bombing destroyed virtually all major cities in North Korea. 
The human cost of the war was extremely high. Approximately 1 million military personnel died during the conflict. Even more people lost their lives as noncombatants. It is estimated that between 1.5 and 3 million Korean civilians were killed. Various sides were accused of war crimes during the fighting. On July 27, 1953, the Korean Armistice Agreement was signed. This agreement ended the combat but did not create a permanent peace. 
The war left a lasting impact on the geography of the peninsula. The armistice created a 4-kilometer wide Demilitarized Zone (DMZ). This zone sits along the frontline to separate the two sides. It includes a Joint Security Area at Panmunjom. Because no peace treaty was ever signed, the conflict is called a "frozen conflict." This means the situation remains tense and could flare up again. 
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