They would all have to be from the promised land.
And guess what,Persia was not an inferior kingdom to Babylon.It was about ten times larger and lasted far longer.It whipped Babylon in one night .
How was Persia inferior to Babylon?
Answer-It wasn't .
Daniel 2:39
After you,
another kingdom will arise, inferior to yours. Next, a third kingdom, one of bronze, will rule over the whole earth.
There is no possibly way Persia was inferior to Babylon.Everything Babylon had ,Persia had and ten times more.Persia even owned Babylon itself.
.Look.at the size difference in this video.
Also pay close attention to what happens to the kingdom at the very end of the video.It is divided just as toes are divided.
After the ten horns come up,the little horn comes up Last.