You need to read your question before you post it.
It became a US State in 1788.
It became the 11th US State in 1788.
It became a state in 1959.
It became the 22nd US State on 14 December 1819.
it never became part of the us
just look on wiki pedia
0 YOU IDIOT!
It became the third US State on 18 December 1787.
montana became part of the US when miley cyrus became popular
it became part of the us in 1832
Thursday, April 30, 1812 (18th state)
When did Nebraska become part of the territory of the US?