US is not a state it is a country!
August 21, 1959.
Wyoming officially became a US state on July 10, 1890.
The 50th state
1998
Uh... Mexico is not a state. It is a country.
December 14th, 1819 it was admitted as the 22nd U.S state but it later left the Union to become a Confederate state
2015
They had to sign up to be a part of the US
Never. Chicago is not a state. Chicago is a city.
Hawaii
I personally don't know.
The date is November 16, 1907.