What did Rome require of allies?

The socii (allies), bound to Rome by treaty, ordinarily did not then have the rights of Roman citizens, yet they were bound to do military service and to pay taxes or tribute, depending on the treaty's terms

explanation:

japan participated in world war i from 1914 to 1918 in an alliance with entente powers and played an important role in securing the sea lanes in the west pacific and indian oceans against the imperial german navy as the member of the allies.

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