As Rome declined, feudalism developed in Western Europe. What was one political need met by this shift to feudalism?

The political need met by this shift to feudalism was that the people of western Europe had issues with security and needed a source of protection from threats.

This led to the political aspect of the people who were rich and wealthy providing enough security for the populace while the people from the lower class ensured they were submissive to the rich class as a means of exchange and appreciation.