It is federal republic, because oligarchy and unitary republic are totally wrong. And the confederal republic was basically the old USA..
The most straightforward theory for Western Rome's collapse pins the fall on a string of military losses sustained against outside forces. Rome had tangled with Germanic tribes for centuries, but by the 300s “barbarian” groups like the Goths had encroached beyond the Empire's borders.
The correct answer is a. the factory was mechanizing, which cost workers their jobs.
Everything was becoming more industrialized and many people lost their jobs because of that.
The answer is C.
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