If it's foreign soil, which foreign country does it belong to?

I honestly don't understand the premise that DC is foreign soil. The US Constitution says DC is under the jurisdiction of the US Congress. DC residents have to pay Federal taxes to the US. They vote for US Presidents.

Could someone please explain how DC is foreign soil in a very simple way that I could understand?

Edited to add;

I did some online searches on this, and the only explanation that came up had to do with the Sovereign Citizens Movement.

So if the answer to my questions from above involve this, then no need to answer.

But if there are any explanations that are not related to the Sovereign Citizens Movement, then I would really appreciate them, thanks.

If it's foreign soil, which foreign country does it belong to?

I honestly don't understand the premise that DC is foreign soil. The US Constitution says DC is under the jurisdiction of the US Congress. DC residents have to pay Federal taxes to the US.

Could someone please explain how DC is foreign soil in a very simple way that I could understand?

Edited to add;

I did some online searches on this, and the only explanation that came up had to do with the Sovereign Citizens Movement.

So if the answer to my questions from above involve this, then no need to answer.

But if there are any explanations that are not related to the Sovereign Citizens Movement, then I would really appreciate them, thanks.

If it's foreign soil, which foreign country does it belong to?

I honestly don't understand the premise that DC is foreign soil. The US Constitution says DC is under the jurisdiction of the US Congress. DC residents have to pay Federal taxes to the US.

Could someone please explain how DC is foreign soil in a very simple way that I could understand?

Edited to add; I did some online searches on this, and the only explanation that came up had to do with the Sovereign Citizens Movement.

So if the answer to my questions from above involve this, then no need to answer.

But if there are any explanations that are not related to the Sovereign Citizens Movement, then I would really appreciate them, thanks.

If it's foreign soil, which foreign country does it belong to?

I honestly don't understand the premise that DC is foreign soil. The US Constitution says DC is under the jurisdiction of the US Congress. DC residents have to pay Federal taxes to the US.

Could someone please explain how DC is foreign soil in a very simple way that I could understand?