Federalism: a little history

Jacob Hornberger has a piece on how federalism declined as an operating principle in America:

without even the semblance of a constitutional amendment, the federal government effectively became a government of general powers with respect to welfare programs and regulation of economic activity. The federal government’s New Deal power became so extensive that its regulation of a farmer who did nothing more than grow wheat on his own farm for his own consumption was upheld by the Court in the famous case of Wickard v. Filburn.