918
Opinion of the Court
as mandates to the States; others, which require only the provision of information to the Federal Government, do not involve the precise issue before us here, which is the forced participation of the States' executive in the actual administration of a federal program. We of course do not address these or other currently operative enactments that are not before us; it will be time enough to do so if and when their validity is challenged in a proper case. For deciding the issue before us here, they are of little relevance. Even assuming they represent assertion of the very same congressional power challenged here, they are of such recent vintage that they are no more probative than the statute before us of a constitutional tradition that lends meaning to the text. Their persuasive force is far outweighed by almost two centuries of apparent congressional avoidance of the practice. Compare INS v. Chadha, 462 U. S. 919 (1983), in which the legislative veto, though enshrined in perhaps hundreds of federal statutes, most of which were enacted in the 1970's and the earliest of which was enacted in 1932, see id., at 967-975 (White, J., dissenting), was nonetheless held unconstitutional.
III
The constitutional practice we have examined above tends to negate the existence of the congressional power asserted here, but is not conclusive. We turn next to consideration of the structure of the Constitution, to see if we can discern among its "essential postulate[s]," Principality of Monaco v. Mississippi, 292 U. S. 313, 322 (1934), a principle that controls the present cases.
A
It is incontestible that the Constitution established a system of "dual sovereignty." Gregory v. Ashcroft, 501 U. S. 452, 457 (1991); Tafflin v. Levitt, 493 U. S. 455, 458 (1990). Although the States surrendered many of their powers to
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