Kush was able to thrive after losing Egypt to the Assyrians because after their defeat, the Kushites retreated south and moved their capital from Napata to Meroë. Meroë offered several advantages: it was safer from Assyrian attacks, had abundant iron ore resources for ironworking, and enjoyed better rainfall than Egypt. The region's access to trade routes—connecting Africa, Arabia, and India—allowed Kush to prosper economically through trade in iron tools, weapons, and other valuable goods. This shift enabled Kush to develop a distinct culture and maintain power and wealth for several more centuries despite losing control of Egypt to the Assyrians.

Key reasons for Kush's post-Egypt prosperity:

• Relocation to Meroë, distant from Assyrian military reach.
• Access to abundant natural resources, especially iron ore.
• Thriving trade connections across the Nile, Red Sea, and beyond.
• Continued development of ironworking industry, making Kush a central hub for iron production in Africa.
• Sustained cultural identity combining Egyptian and local African traditions.

Thus, Kush's strategic relocation and economic adaptation allowed it to flourish after losing Egypt to the Assyrians.