Sharepoint List Help

Hello, I am trying to create a sharepoint list, where one of the option is to enter a two digit state.   I currently have an =OR statement that works just fine:

=OR(State="AR",State="AZ",State="CA",State="IL",State="IN",State="KS",State="MI",State="MO",State="NV",State="OH",State="OK",State="TX",State="WI")

if a user does not enter one of the above state abbreviations in the sharepoint form, they get an error.

however, I now need to add additional states.   where I will have a total of 35:

=OR(State="AR",State="AZ",State="CA",State="CO",State="CT",State="DE",State="HI",State="IA",State="ID",State="IL",State="IN",State="KS",State="MA",State="MD",State="ME",State="MN",State="MI",State="MO",State="MT",State="NE",State="NM",State="NJ",State="NV",State="NY",State="OH",State="OK",State="OR",State="PA",State="RI",State="TX",State="UT",State="VA",State="WA",State="WI",State="WV")

I get an error on this, and from what i read, only 30 OR statements are allowed.   is there a better way to go about doing this?   while keeping it simple?    I have read where you can nest AND statements, but can you nest OR statements somehow?   thanks in advance.