[Ken H]

Do states set their own border policies?

No. Congress is delegated that authority under the power to regulate foreign commerce and to repel invasions.

How about their immigration policies, do they set them?

I believe that power was delegated to Congress by I.9.1, if memory serves.

Do states set their own tariffs, and trade policies?

Congress was delegated that power under I.8.3 (foreign commmerce), and states are expressly forbidden to do so.

Can the federal government even federalize their national guard troops?

Yes. Congress shall have power...

To provide for calling forth the Militia to execute the Laws of the Union, suppress Insurrections and repel Invasions;

To provide for organizing, arming, and disciplining, the Militia, and for governing such Part of them as may be employed in the Service of the United States, reserving to the States respectively, the Appointment of the Officers, and the Authority of training the Militia according to the discipline prescribed by Congress;

-snip-

The federal government has set drug policies so that they are uniform between the states. The federal laws on drugs have been judged to trump state laws.

Would you tell us which section of the Constitution you believe delegates to Congress the authority to regulate intrastate drug policies?

[DoughtyOne]

Would you tell me what section of the Constitution specifically grants Congress the authority to devise any federal statutes? And yet there are federal statutes.]

There are thousands of them. There are thousands of them that go across state lines.

You are aware of that right?

[OneWingedShark]

>Do states set their own border policies?
No. Congress is delegated that authority under the power to regulate foreign commerce and to repel invasions.

Er, the states can also repel invasions. Most of their Constitutions have such wording.