JUSTICE SOUTER delivered the opinion of the Court.
In this case we return again to the history and geography of the Ohio River valley, as we consider the location of the boundary of the Commonwealth of Kentucky with the State of Illinois. We hold it to be the line of the low-water mark along the river's northerly shore as it was in 1792.
I
In July 1986, Illinois sought leave to file a bill of complaint against...
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