the possessive s with countries

[pablo_ivher]

Is it possible to use the possessive s with countries like

new york's state
oklahoma's state


or just possible to use

the state of oklahoma????

[Nordic Bill]

You would write these as New York State, Oklahoma State, etc. The genitive "of" is also correct, i.e. The state of New York but "state" would not be capitalized when used together with "of".

[Casiopea]

In addition, New York and Oklahoma are states; they don't own states, which is how "New York's State" and "Oklahoma's State" are read. Apostrophe -s is not required. It changes the meaning.