Darius contributed to the success of Persian civilization by

Darius led military campaigns in Europe, Greece, and even in the Indus valley, conquering lands and expanding his empire.

Explanation:

His reign lasted 36 years, from 522 to 486 BCE; during this time the Persian Empire reached its peak. Darius I improved the Persian government by dividing the Persian Empire into provinces and implementing numerous construction projects. Theses projects included the construction of a new capital at Persepolis and roads throughout the empire.

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affirmative action refers to the policies that take gender, race, or ethnicity into account in order to promote equal opportunity.

employers subject to title vii are prohibited from taking race or sex into account in any employment decisions. aa is a penalty for having any job group substantially statistically "underutilized" in any race or either sex. the employer must take steps to eliminate the underutilization, then stop, ending its aa efforts