After the New Kingdom, Egypt fell to Alexander the Great.
Explanation:
Egypt is one of the oldest and one of the most glorious civilizations, and it managed to sustain itself and progress for several thousand of years, which is very admirable. By the end of the New Kingdom though, Egypt was on the downfall. The country was in mess, with the people being very unhappy and revolted, the aristocracy was losing its power because of terrible politics and internal affairs. Macedon was on the rise in meantime, and with Alexander III of Macedon (the Great) the Balkan kingdom was conquering more and more territory. Being in mess and not unified, and facing a professional well organized army, Egypt fell under the rule of the Macedonians.
Once conquered, the Egyptians actually saw Alexander as a savior.
Alexander was even given the title of a pharaoh in Egypt.
Alexander established the city of Alexandria, which soon became the center of science and knowledge in the Old World.
After Alexander's death, the Macedonian Empire split into four parts, with the Ptolemaic dynasty ruling over Egypt.