In the Middle Kingdom who did Egypt conquer?

Answer 1

The "Middle Kingdom" marks the reunification of Egypt under a single ruler - so the victorious ruler (Mentuhotep II) could be considered to have conquered (or re-conquered) northern Egypt on his way to unifying Egypt. Mentuhotep II also conquered or restored Egyptian control over the Sinai and conquered much of Nubia and controlled much of the Oases to the west as well as areas stretching up into Palestine (although these were more a matter of moving forces into and exercising control rather than conquering existing forces)