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Mississippi was admitted into the Union on December 10, 1817 becoming the 20th state to join the Union.
Maine and Missouri. Missouri was admitted as a slave state and Maine was admitted as a free state due to where they were located on the map.
Hawaii was admitted into the Union on August 21, 1959 becoming the 50th state to join the union. Alaska was admitted into the Union on January 3, 1959 becoming the 49th state to join the Union.
The last state to be formed in the US was Hawaii. The territory of Hawaii was admitted to statehood on August 21, 1959 as the 50th state.
Technically, any city in Hawaii is the most recent addition to United States, as Hawaii wasn't founded as a state until 1959. But Hawaii's cities were already established by then, so the most recent city to be established and built in the United States is Las Vegas, founded in 1905.