Sch K-1 Wks-Partnerships: Box 16 is checked, but there are no entries in the Schedule K-3

Hi,

I have a schedule K-1 with box 16 checked and I have the K-3 for it.

In schedule K-3, Part II, Section 1, the only country listed is US.  However, in TurboTax, the field "Name of country or US Possession" does not have a choice for US.

What should I choose?

Thanks