Korea was split into two parts. 
Long ago, Korea was ruled by Japan. 
These two sides had a big war. 
When the war stopped, the land stayed split. The two sides stayed apart for a long time. They even had different leaders.
Sometimes, the two sides had small fights. They also worked to build their own lands. They both wanted to lead all of Korea.
Today, the two sides still live apart. 
For a long time, Japan ruled Korea. 

In 1948, two new governments formed. North Korea had Kim Il Sung as leader. South Korea had Syngman Rhee as leader. Both sides wanted to rule all of Korea. This led to the Korean War from 1950 to 1953. 
A special zone called the DMZ was made. It sits between the two sides. This area is very militarized. 
The Korean conflict is a long disagreement between two parts of one land. North Korea and South Korea are the two sides. Both countries claim they are the only real government for all of Korea. This split began after Japan stopped ruling Korea in 1945. 

To understand the split, we must look at how the land was divided. In 1945, the Soviet Union moved into the north. They entered Pyongyang on August 24. 
Two main leaders emerged during this time. In the north, Kim Il Sung became the leader. He had served in the Soviet Army before. 
War broke out between the two sides from 1950 to 1953. North Korea invaded the south on June 25, 1950. The fighting was very hard and caused much damage. 
The conflict is still happening today. The border is the most militarized private area in the world. 
The Korean conflict is a long-standing political and military standoff. It involves the division of the Korean Peninsula into two separate nations. These are North Korea, officially the Democratic People's Republic of Korea (DPRK), and South Korea, known as the Republic of Korea (ROK). Both nations claim to be the only legitimate government for the entire peninsula. This division is one of the world's oldest frozen conflicts. 
The roots of this division began with the end of Japanese rule. The Empire of Japan had annexed Korea in 1910. Japanese rule ended on September 2, 1945. After Japan's defeat, the United States and the Soviet Union divided the land. They used the 38th parallel as a dividing line. The Soviet Red Army entered Pyongyang on August 24, 1945. American forces landed in the south on September 8, 1945. 
Two different political systems emerged during the occupation. In the north, the Soviet Union supported communist leaders. Kim Il Sung became the primary political figure there. He had previously served in the Soviet Army. The North adopted a centralized, collectivized model. In the south, the United States supported anti-communist leaders. Syngman Rhee became the most prominent politician in the south. He had been educated in the United States. 
Violent tensions led to the Korean War from 1950 to 1953. North Korea invaded the south on June 25, 1950. Kim Il Sung believed the victory would be quick. He expected pro-communist uprisings in the south. However, the United Nations Command, led by the U.S., intervened to defend the south. Later, Chinese forces entered the war to support the north. 
An armistice was signed on July 27, 1953. An armistice is an agreement to stop fighting. It is not the same as a formal peace treaty. The agreement created the Korean Demilitarized Zone (DMZ). This buffer zone sits near the 38th parallel. The DMZ is now the most militarized private area in the world. 
During the Cold War, the two nations stayed aligned with opposing global powers. North Korea signed defense treaties with the Soviet Union and China. The South signed a mutual defense treaty with the United States in 1953. North Korea developed a doctrine called Juche, which means self-reliance. This led to extreme military mobilization. They even built many facilities underground to protect them. 
Recent years have seen both hope and renewed tension. In 2018, leaders held several summits. They signed the Panmunjom Declaration on April 27, 2018. This document aimed to denuclearize the peninsula and work toward reunification. However, these diplomatic efforts eventually faltered. North Korea has continued to develop missile and nuclear capabilities. The peninsula remains a place of significant international concern and military presence.
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