Which of the following was NOT the consequence of an invasion?

Question

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The fall of the Mayan civilization was not brought on by invasion. The civilization lasted from approximately 1800 B.C.E. until 1100 C.E. The general academic consensus about the fall of the Mayas is that some combination of ecological factors (likely a massive drought) and over-expansion (which may have led to a peasant revolt) precipitated a sudden decline. In contrast, the Han, Romans, and Gupta all had expanding empires, and their growing borders became too difficult to monitor effectively. Ultimately, a major invasion or a series of small invasions led to the demise of each one.

Which of the Following Was NOT the Consequence of an Invasion