Which roman politician said that roman soldiers fight and die to protect the wealth and luxury of others; they are styled masters of the world and have not a clod of earth they call their own?

Tiberius Gracchus.

Explanation:

Tiberius Gracchus and Gaius Gracchus (Gracchus brothers) were two politicians from Rome who looked forward to reforming the social and political structure of this country to assist the poor. They spoke for the plebs (commoners) in the government of Rome and were part of an organization of activists that wanted to carry out land reforms to help the poor.

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  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.