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MarshallBruceMathers
The main reason why the feudal system probably would not have developed if the Roman Empire continued is because "A strong military would have been in place to protect people from invaders" since this is how the Romans kept peace in the past. 
millermoldwarp

Correct answer:

A strong military would have been in place to protect people from invaders.

It was strongly believed that union makes strength. Reason for which militarized protection existed in the Roman Empire. In fact, in the Roman Empire there were professional armies that guarded the peace and tranquility of the empire.