The predecessor to the 10th amendment was Article 2 of the Articles of Confederation:
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.
Note it says expressly delegated. Also note the word expressly was not included in the Constitution, which has led to much of the implied stuff of concern to Wilmeth and many of us.
For an interesting discussion on all this go here and read Lash's article.