Sql query related to beaking the string based on string postion

Hi,
I have coloumn in this way
city_state
texas tx
sanantanio tx
newyork ny
newjersy nj
newyork
newjersy
landon 1000
I want to get the last characters after the space from the string(eg: texas tx) only tx, that means i want to only break the strings that have space in the 3rd position when counting the string from back. the others records that do not match as above stated should decoded as 'unknown'
(eg 'landon 1000' decode as unknown or 'newyork' decode to unknown )
can anyone please help out on this query.
thanks,
Ram

with t as (
           select 'texas tx' city_state from dual union all
           select 'sanantanio tx' from dual union all
           select 'newyork ny' from dual union all
           select 'newjersy nj' from dual union all
           select 'newyork ' from dual union all
           select 'newjersy' from dual union all
           select 'landon 1000' from dual
select city_state,
        case
          when regexp_like(city_state,' ..$') then substr(city_state,-2)
          else 'unknown'
        end state
from t
CITY_STATE    STATE
texas tx      tx
sanantanio tx tx
newyork ny    ny
newjersy nj   nj
newyork       unknown
newjersy      unknown
landon 1000   unknown
7 rows selected.
SQL> SY.

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>
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