The Second Korean War.

The Second Korean War (January 1, 2017 to March 12, 2018) was a war that occurred between the nations of the Republic of Korea (South Korea), supported by the United States and the United Nations, and the Democratic People's Republic of Korea (North Korea). Though North Korea and South were still technically a war, due to the Korean Armistice Agreement, a cease-fire has always been present between the two nations. 

The war was a result of North Korea launching nuclear warheads across South Korea at 12:00 midnight, having declared war exactly one hour earlier. Though no formal reasons for the declaration are known, many Korean officials say that it was because of an incident that occurred weeks earlier, where a artillery cannon accidentally fired on a North Korea barracks at the Demilitarized Zone, resulting a firefight that lasted for two hours. South Korea had said that the shot was due to malfunction within the cannons launcher; however North Korea denied this claim and stated that it was a direct tactic to fear-monger the North. 

Initially North Korea had managed to push South Korea back to Seoul, however, this quickly changed as South Korea's military managed to regroup and push the North back. Though the United States did not formally declare war with North Korea, they did relegate the USFK to assist the South Koreans. With one year, North Korea had been pushed all the way back into the mountains, and on March 12, 2018, unconditionally surrendered to South Korea. South Korea then annexed the North and officially announced the reunification of North and South Korea on March 14, and also announced to renaming of the Korean country to the Unified Korean Republic.

The Second Korean War is considered one of the costliest wars in history. Due to the suddenness of the nuclear attack at the beginning of the war, most people were not able get shelters in time, resulting in millions dead. It's estimated that of the 61 million people living South Korea before the war, over 70% of people were killed during the entirety of the war. it was even worse for North Korea, where many people killed themselves to prevent them from being captured by the South, owed in part to North Korea's brainwashing tactics.

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This is also my first time doing a Wikipedia style template. Pretty fun, though a bit monotonous.