What policies regarding big business was Roosevelt able to
implement?

Square Deal

Explanation:

His "Square Deal" included regulation of railroad rates and pure foods and drugs; he saw it as a fair deal for both the average citizen and the businessmen. Sympathetic to both business and labor, Roosevelt avoided labor strife, most notably negotiating a settlement to the great Coal Strike of 1902.

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b) they want the land taken away from the wealthy landowners and given to peasants.

he was able to speed up production of the processing of seeds