Did the people reply with 50 really get the correct answer? Is this making the assumption that there is a "known" list of states, that addresses are entered cor

Did the people reply with 50 really get the correct answer? Is this making the assumption that there is a "known" list of states, that addresses are entered correctly, that we're talking about a specific country? The only way we really know the answer to this question is by placing a lot of bias into our answer.