By devising the "three fifths" compromise and entering it into Article I Section 2 of the Constitution as census of enumeration scheme, the framers of the Constitution shamelessly sidestepped the issue of slavery by relegating slaves to being known as "other persons" who comprise only three fifths of a person hood and in doing so condoned slavery, and set precedent for the notion that not all people are created equal. Because slaves were deemed to be only three fifths of a person, they could not enjoy the rights belonging to a whole person and so the business of slavery went about its day to day business until the passage of the 13th Amendment and the Civil War that followed.
The Constitution gives Congress the power to regulate interstate commerce, and presumably interstate trade or transport of slaves. Otherwise, state laws would generally apply (ownership rights and obligations, transfer, upkeep, treatment, marriages, offspring, etc).
In the United States, the power to grant titles of nobility is prohibited by the Constitution.
The weak Congress created under the Articles of Confederation had no power to regulate interstate trade and little authority over foreign commerce, so Congress was given the power to tax.
Power to set state taxes.
because he didn't have the power to do it
present
President
Congress cannot regulate foreign trade.
Yes, it is expressed in Article I, Section 8 as the power to regulate commerce with foreign nations and among the several states and with the Indian tribes.
That is not within the President's power.
good question
commerce clause