Answer: Most likely All of the above.
Explanation:
The middle ages was time period of growth and evolution. People were tired of the old ways hints* why the feudal system ended. People began to question authority, and the lower classes rebelled against the upper class, because they felt like they were being used and they also wanted to see change in their society.
During this time period people wanted to explore undiscovered lands, so that they could conquer certain territory, hints why barbarians attacked kingdoms ( for power. )
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