Answer :
Final answer:
Army officers, wealthy landowners, and industrialists supported Mussolini in his overthrow of the government due to shared interests and promises of stability.
Explanation:
The main groups that supported Mussolini's effort to overthrow the government included army officers, wealthy landowners, and industrialists. These groups found common ground in Mussolini's promise of order, stability, and a return to Italy's ancient greatness, leading to their backing of his rise to power.
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