Powers retained by the States and the people
Enumerated Powers

Reference

Amendment X to the U.S. Constitution
"The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States, respectively, or to the people."

Articles

Do Our Rights Come from the Constitution?, by Jacob Hornberger, Future of Freedom, Jun 1999
"The Constitution made it clear that this government, unlike others in history, would not be one of unlimited powers. Instead, ... the federal government would be one of limited, enumerated powers. For example, the powers of Congress are limited to those enumerated in Article 1, Section 8 of the Constitution."
UpdJames Madison: Father of the Implied-Powers Doctrine, by Sheldon Richman, 26 Jul 2013
Examines whether James Madison intended the U.S. federal government to have "expressly delegated" powers vs. "powers by implication"
"Twelve amendments made the final cut in the congressional committee [writing a bill of rights]. Amendment XII (later to become X when two failed to be ratified by the states) read,
The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.
It was a pale reflection of the old Article II. On seeing this language, Rep. Thomas Tudor Tucker of South Carolina rose to amend the amendment by inserting the word expressly before the word delegated."
Penumbras, Emanations, and Stuff, by Joseph Sobran, The Reactionary Utopian, 6 Feb 2006
"The Tenth is often referred to as 'the states' rights amendment,' but that's not quite accurate. It speaks of powers, not rights. ... The Federal Government could exercise only those powers listed ... in Article I, Section 8. It was pretty specific: coining (not printing) money, punishing counterfeiters, declaring war, and so forth. "
The Bill of Rights: Reserved Powers, by Jacob Hornberger, Future of Freedom, May 2005
"This system of federal and state powers is known as 'federalism.' By dividing power in that way, the idea was to keep the central government weak and keep political power closer to the people. Compare that to a country that has one central, national government, which is responsible for governing the entire nation."
Related Topic: Enumerated Powers
UpdThe Constitution or Liberty, by Sheldon Richman, 21 Sep 2012
Contrasts Article II of the Articles of Confederation with the Tenth Amendment and Article I, Section 8 of the U.S. Constitution, and discusses the implied powers of the latter document (revised version of article published 7 Dec 2007)
"'Each state retains its sovereignty, freedom, and independence, and every power, jurisdiction, and right, which is not by this Confederation expressly delegated to the United States, in Congress assembled.' We might think those words ... are in the U.S. Constitution. But they are not. They are from Article II of the Articles of Confederation ... They ... were deliberately left out in 1787. After the Constitution was ratified, something like Article II was added to the Constitution as the Tenth Amendment. Unfortunately it is like Article II in the same sense that a whale is like a fish—superficially."
Tired of Two Parties?: Blame the centralization of the federal government, not the Constitution, by Pradeep Chhibber, Ken Kollman, The Washington Post, 17 Aug 2004
"... the truth is that the United States has not always been so dominated by two parties. ... Starting in the 1930s, however, minor parties stopped winning significant shares of votes for elections to Congress ... The decline in voting for minor parties has corresponded to the increasing power of the national government relative to the states."
Related Topic: Political Parties
What Is the Constitution?, by Sheldon Richman, Future of Freedom, Jun 2002
Discusses constitutional interpretation, in particular the ninth and tenth amendments, in light of comments from Antonin Scalia about a national ID card
"James Madison, the acknowledged father of the Constitution, said that the central government was delegated powers that are few and defined. This is backed up by the Constitution itself. Article I, Sec. 8 contains a short list of powers given to the Congress. To reinforce this point, the Tenth Amendment (in the Bill of Rights), ... was adopted at the urging of those who thought the Constitution would allow the government to grow too powerful ..."