The Korean War ended with a demilitarized zone and a signing of an armistice.
The answer that fits the blank is POPULATION TRANSFER AND GENOCIDE. Population transfer is the movement of a large group of people to another place or region, in short, they are forcefully migrated. Genocide is the term given to the massive killing of a group of people. These are their ways that Bosnian Serbs cleansed their Muslim population.
This is referring to the first shot fired at the Battle of Lexington and Concord. Although it's unlikely that the very first shot was fired, this even nonetheless began the Revolutionary War.
The Armenian Genocide happened in world war I due to the rising tension between the young Turk government and the christian Armenians. The Turks largely followed the teaching of jihad, or "the holy war'' which taught them to kill all non Muslims. The Armenian community was made up of three religious denominations: Armenian Catholic, Armenian Protestant, and Armenian Apostolic, the Church of the vast majority of Armenians. the Armenians, because they were not Muslim but Christian were killed in mass. Over 1.5 million Armenians were slaughtered.