Which of these made Egypt an empire?

Name: Which of these made Egypt an empire?
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Question

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Expansion into Nubia allowed Egypt to establish control over valuable resources and trade routes, as well as gain access to more territory and potential subjects to add to their empire. Unification of Upper and Lower Egypt, creation of the title "pharaoh," and the reign of Ramses II were all important developments in Egyptian history, but they did not specifically lead to the establishment of an empire.

Which of These Made Egypt an Empire