If driving in straight line south-east from the most Northwestern part of Washington to the most southeastern Louisiana, the number of states one would pass through on the journey is:
Seven (7) states.
This is because driving in straight line south-east from the most Northwestern part of Washington to the most southeastern Louisiana, one would pass through the following states:
Hence, in this case, the correct answer is that one will pass through Seven states from the most Northwestern part of Washington to the most southeastern Louisiana.
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