The process that saw Western Europe going from a unified Roman Empire to independent nation-states was:
After the Roman empire broke up as a result of several factors including the incursions of barbarians, several kingdoms were formed.
These kingdoms expanded and contracted under the reign of kings who shared power with nobles. Eventually, the monarchs gained the upper hand and established independent nation-states.
Find out more on the fall of the Roman empire at https://brainly.com/question/1276486.
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