Summary

Portrait of Philip Pendleton Barbour Philip Pendleton Barbour Wilcox v. Jackson — Opinion of the Court

That would be to make the laws of Illinois paramount to those of Congress, in relation to a subject confided by the Constitution to Congress only. And the practical result in this very case would be, by force of state legislation to take from the United States their own land, against their own will, and against their own laws. We hold the true principle to be this, that whenever the question in any Court, state or federal, is, whether a title to land which had once been the property of the United States has passed, that question must be resolved by the laws of the United States
Source: Wikisource

Portrait of Philip Pendleton Barbour Philip Pendleton Barbour Wilcox v. Jackson — Opinion of the Court

How much was expended in the buildings at the military post we have no means of knowing, but probably a considerably larger sum. Thus, besides the land purchased, for the sum of $94 61, he would recover property, and that too property necessary for the military defence and commerce of the country, which cost the United States many thousands of dollars; and if there had been expended upon it as many hundreds of thousands, as there have been thousands, the same result would follow. A principle leading to such startling consequences cannot in our opinion be a sound one.
Source: Wikisource

Portrait of Philip Pendleton Barbour Philip Pendleton Barbour Wilcox v. Jackson — Opinion of the Court

We now return to the inquiry whether the land in question falls within any of the prohibitions contained in the act of Congress. Amongst others, lands, which may have been appropriated for any purpose whatsoever, are exempt from liability to the right of pre-emption. Now, that the land in question has been appropriated in point of fact there can be no doubt, for the case agreed states that it has been used from the year 1804 until and after the institution of this suit, as well for the purpose of a military post as for that of an Indian agency, with some occasional interruption.
Source: Wikisource

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