<Tr> <Td_colspan="2"> Approximate extent of the Great Plains </Td> </Tr> <P> The Great Plains (sometimes simply "the Plains") is the broad expanse of flat land (a plain), much of it covered in prairie, steppe, and grassland, that lies west of the Mississippi River tallgrass prairie states and east of the Rocky Mountains in the United States and Canada . It embraces </P> <Ul> <Li> the entirety of the states of Kansas, Nebraska, South Dakota, and North Dakota, </Li> <Li> parts of the states of Colorado, Montana, New Mexico, Oklahoma, Texas, Wyoming </Li> </Ul> <Li> the entirety of the states of Kansas, Nebraska, South Dakota, and North Dakota, </Li>

How many states make up the great plains
find me the text answering this question