Rolla is a city in Morton County, Kansas, United States. As of the 2020 census, the population of the city was 384. For many millennia, the G…Rolla is a city in Morton County, Kansas, United States. As of the 2020 census, the population of the city was 384. For many millennia, the Great Plains of North America was inhabited by nomadic Native Americans. From the 16th century to 18th century, the Kingdom of France claimed ownership of large parts of North America. In 1762, after the French and Indian War, France secretly ceded New France to Spain, per the Treaty of Fontainebleau.
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