Perhaps our Founders would have been well-advised to make the 9th and 10th the 1st and 2nd amendments? Perhaps it can be attributed to the fact that the 9th and 10th follow the more "boring" rights outlined toward the end of the list. Indeed, some of the Founders (I think Madison was among them) did not want a Bill of Rights because they believed that years later, an enumeration of rights would be construed to be exhaustive so that therefore any rights not enumerated were assumed to not be retained. Their compromise was the 9th and 10th Amendments.
However, more likely, it is a result of a concerted effort over time to push power toward Washington and away from the States. The assumption now has become that the Federal government (specifically Congress) possesses ALL power, carte blanche, to achieve its desired ends. And this all-encompoassing power is limited only by a few citations in the Bill of Rights.
This is an exact reversal of how things were designed. Congress (and indeed the rest of the Federal Government), by default, is assumed to have ZERO power. Then, as the Constitution spells out, we add certain narrowly defined exceptions to this rule of "zero power". So the Constitution serves to spell out a few exceptions to the presumed powerlessness of the federal government. Whereas the popular perception today is that the Constitution serves to spell out the few exceptions to the presumed omnipotence of the federal government.
What's also not understood is that the original design of things was to be that the Federal government and the State governments were to be co-equal. Now in interstate affairs, the Federal government would take precedence because that was its domain. The Federal domain was interstate disputes, and foreign relations. The Federal government was NEVER supposed to meddle in the internal affairs of States nor make laws that usurp the State's sovereignty as the sole power concerning intrastate affairs. Here's a good quote illustrating this intent:
QUOTE
"The true theory of our Constitution is surely the wisest and best, that the States are independent as to everything within themselves, and united as to everything respecting foreign nations." --Thomas Jefferson
"It is a fatal heresy to suppose that either our State governments are superior to the Federal or the Federal to the States. The people, to whom all authority belongs, have divided the powers of government into two distinct departments, the leading characters of which are foreign and domestic; and they have appointed for each a distinct set of functionaries. These they have made coordinate, checking and balancing each other like the three cardinal departments in the individual States; each equally supreme as to the powers delegated to itself, and neither authorized ultimately to decide what belongs to itself or to its coparcener in government. As independent, in fact, as different nations." --Thomas Jefferson
"With respect to our State and federal governments, I do not think their relations correctly understood by foreigners. They generally suppose the former subordinate to the latter. But this is not the case. They are co-ordinate departments of one simple and integral whole." --Thomas Jefferson