Trivia: What river flows through the most U.S. state capitals?
Missouri
Mississippi
Rio Grande
Colorado
The correct answer is Missouri
So why is this answer correct? : Flowing for 2,341 miles through seven states, the Missouri River is America’s longest river and is responsible for draining around one-sixth of the entire continent of North America. The Missouri originates at one of the highest points on the North American continent, in the Rocky Mountains of Montana. The Missouri is actually the longest tributary of the Mississippi River, which itself is the second-longest river in the United States.