Well, you were partially mis-informed.
The sale is indeed subject to capital gains tax here in the USA.
However, what is important is how you determine your tax basis in the property for computation of gain.
Under REV. RUL. 84-139, 1984-2 C.B. 168, a US Citizen who inherits real property located in a foreign country from a non-citizen determines his tax basis in the same way that it is determined if the property were located in the US.
For purposes of reference, here's the actual code sections that apply:
Foreign real property that is inherited by a United States citizen (A)from a nonresident alien(B) will receive a step-up in basis under sections 1014(a)(1) and 1014(b)(1) of the Code. A’s basis in the real property sold is the fair market value of the property on the date of B’s death, as determined under sections 1014(a)(1) and 1014(b)(1) of the Code.
So, if your uncle died within 9 mos to 1 year prior to the date of sale, the IRS, absent any information to the contrary, will normally accept the gross selling price on the date of sale as the fair market value of the property on the date of death.
What that translates to in plain English, is that you will have no capital gain and probably a capital loss.
Let me finish........................