In 1912 either or both of Arizona and New Mexico gained statehood.
The most recent state is Hawaii, founded in 1959.
Hawaii.
The latest French constitution established the Fifth Republic, in 1958.
Hawaii.
Hawaii was the most recent state to join the Union.
The state of Queensland has been the most affected.
Wisconsin
The most recent American flag, featuring 50 stars representing the states, was designed by Robert G. Heft in 1958. Heft was a high school student who submitted his design as part of a class project. This design was officially adopted on July 4, 1960, following Hawaii's admission as the 50th state.
As of my last update in October 2023, the most recent state to join the United States is Hawaii, which became the 50th state on August 21, 1959. If there have been any changes or new states admitted after that date, I would not be aware of them.
Chris Gamble
The comparative of "recent" is "more recent," and the superlative is "most recent."
Tennessee has produced the most Junior Miss titleholders since the program started in 1958.