Hi Larry

Here are the answers!!:

The four biggest rivers in the USA are: Mississippi, Colorado, Rio Grande and Ohio.
(Mississippi River) Minnesota, Wisconsin, Iowa, Illinois, Missouri, Arkansasm, Louisiana, Mississippi.
(Colorado) Texas.
(Rio Grande) Colorado, New Mexico, Texas.
(Ohio) Pennsylvania, West Virginia, Ohio, Kentucky, Indiana.

(Rio Grande) El Paso: Population of 598,590 people, its the 6th largest city in Texas and the 21st largest in USA. It is on the Mexican Border.
(Mississippi) New Orleans: Is one of the oldest cities in America, it is considered the birthplace of Jazz and has been called the 'Most unique city in America'. Annual Mardi Gras carnivals are held. In 2005 it was devastated by flooding after Hurricane Katrina hit followed by Hurricane Rita.
(Colorado) Austin: Is the 16th largest city in USA and the 4th largest in Texas, it has a population of 690,252 people. First record of settlement was in 1835 when the city was called Waterloo but was renamed in 1839 in honour of Stephen F Austin.
(Ohio) Cincinnati: Has a population of 331,310 people, it is home to major-league sports such as baseball, football and hockey. It is nicknamed 'The Queen City' and was the first major American 'Boomtown'.