Explanation:
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The US's the fear of Radicals and the Bolshevik revolution in Russia. US Police roundedup suspected foreign born radicals and had them expelled from the United States. Fed growing demands to limit immigration.
"They developed an extensive system of paved stone roads" is the one factor among the following choices given in the question that a<span>llowed the Incas to use their military efficiently. The correct option among all the options that are given in the question is the first option. I hope the answer helped you.</span>
