Question

alexander the great defeated this empire in 326 bc, taking control of the middle east and egypt
macedonia
persia
alexandria
egypt

Explanation:

The text describes Alexander the Great defeating an empire (Persian Empire, as Persia is shown) in 326 BC and taking control of the Middle East and Egypt. This is a historical event, so the subfield of History (under Social Science) applies.

Answer:

The subfield is History (under Social Science). The event is about Alexander the Great's military conquests (defeating Persia - related empire in 326 BC, taking Middle East and Egypt), which is a historical topic.