10 most difficult United States riddles A list of ten (out of 58) United States related questions that are the most often answered incorrectly United States quiz What is the longest river in the United States?Missouri. The Missouri River is the longest river in North America. Having 2,341 mi (3,768 km), it is longer than the Mississippi (2,202 mi 3,544 km). When combined with the lower Mississippi River, it forms the world's third longest river system, after the Nile and Amazon.very hard 23% MississippiMississippi61%MissouriMissouri23%YukonYukon8%Rio GrandeRio Grande6%Created by: Shankar Kumar. Statistics based on 3882 answers in 4 languages »rivers of North America riddles » What nationality was Martin Van Buren?American. Martin Van Buren was the eighth president of the United States. 'Van' suggests Dutch origin of his surname, but the capitalized form indicates anglicised version - like Eddie Van Halen (as opposite to Dutch lower-case Vincent van Gogh).very hard 28% DutchDutch56%AmericanAmerican28%RussianRussian4%GermanGerman11%Created by: globalquiz.org. Statistics based on 5003 answers in 2 languages »Netherlands riddles » How many Summer Olympic games were held in the United States?4. There were Olympic Games in St. Louis (1904), twice in Los Angeles (1932, 1984) and in Atlanta (1996)very hard 30% 1110%2228%3330%4430%Created by: Kasia. Statistics based on 5037 answers in 2 languages »sport of North America riddles » What is the third longest river of the North America? (after Mississippi and Missouri)Yukon, having 1,979 mi (3,185 km), is just 223 miles shorter than Mississippi. Despite its length, there are only four vehicles-carrying bridges across the river.very hard 30% Rio GrandeRio Grande22%YukonYukon30%ColoradoColorado42%ArkansasArkansas3%Created by: globalquiz.org. Statistics based on 7700 answers in 2 languages »geography of the United States riddles » Why is White Sands Desert in New Mexico so purely white?It is gypsum. White Sands, having 442 total square kilometers of dune fields, is the world's largest surface deposit of gypsum. Unlike other desert sands, it is cool to the touch, due to the high rate of evaporation of surface moisture and the fact that the sands reflect, rather than absorb, the sun's rays.very hard 31% it is gypsumit is gypsum31%it is very fine grained sandit is very fine grained sand10%it iswhite quartzit iswhite quartz35%it is an optical illusionit is an optical illusion22%Created by: Debbie Fox. Statistics based on 10057 answers in 4 languages »soil riddles » Which was the last of the contiguous states to become a U.S. state?Arizona is the place of the Apache resistance. It became a U.S. state on February 14, 1912. This resulted in the end to the territorial colonization of Continental North America. very hard 32% New YorkNew York18%TexasTexas21%ArizonaArizona32%North DakotaNorth Dakota28%Created by: Sumit Tamang. Statistics based on 3468 answers in 2 languages »Amerindians riddles » Which volcano is known as being one of the most active, but at the same one of the least violent in the world?Kīlauea, Hawaii. Kīlauea is one of the most active volcanoes on the planet and an invaluable resource for volcanologists who are able to study it up close due to its exclusively non-violent effusive activity. Kīlauea lacks a distinct peak and lies close to Mauna Loa.very hard 36% Mt Etna, ItalyMt Etna, Italy22%Kīlauea, HawaiiKīlauea, Hawaii36%Eyjafjallajökull, IcelandEyjafjallajökull, Iceland32%Mt Pinatubo, PhilippinesMt Pinatubo, Philippines7%Created by: globalquiz.org. Statistics based on 5710 answers in 4 languages »Hawaii riddles » Which of the following North American rivers has the lowest discharge?Rio Grande is the fourth or fifth longest river system in North America, but it flows through arid and desert regions. The average discharge is just 82 m³/s (St Lawrence: 10100, Yukon: 6200, Colorado: 1200). It is also very variable, occasionally rising to over 10000 m³/s or dropping to 1 m³/s. During portions of 2001 and 2002 the mouth of the Rio Grande was blocked by a sandbar. very hard 37% Rio GrandeRio Grande37%St LawrenceSt Lawrence24%YukonYukon19%ColoradoColorado18%Created by: Riho Ishii. Statistics based on 9216 answers in 2 languages »geography of Mexico riddles » What is the largest tribal grouping of Native Americans in the United States?Cherokee. According to the 2000 census, 281,069 U.S. citizens self-identify as Cherokee. These numbers are closely followed by Navajo (269,202). Other tribal groups are considerably smaller, only Sioux (108,272) and Chippewa (105,907) exceed 100,000.very hard 37% CherokeeCherokee37%ApacheApache34%SiouxSioux22%CreekCreek5%Created by: globalquiz.org. Statistics based on 6393 answers in 2 languages »peoples riddles » How many U.S. Presidents have been assassinated?Four. These were Abraham Lincoln, James A. Garfield, William McKinley and John F. Kennedy. In addition to that, the death of Warren G. Harding is rumored to be an effect of poisoning.very hard 39% oneone5%twotwo24%threethree30%fourfour39%Created by: globalquiz.org. Statistics based on 8402 answers in 2 languages »presidents of the United States riddles » Play United States quiz and see all the questions.