The two persian leaders who tried to conquer greece were:

The two Persian leaders who tried to conquer Greece were "King Darius I and his successor Xerxes I."

Darius the Great or Darious I was the fourth king of the Persian Achaemenid Empire.

Xerxes, also known as Xerxes the Great was the fifth king of kings of the Achaemenid dynasty of Persia. He was Darius´I predecessor, and as well as  Darius the Great, and he ran the empire at its territorial apex.  

The Greco-Persian wars were series of battles lasting for around 50 years in the 5th century BC.

The Persians tried to gain the territory of the Greek city-states, in multiple attemps.

relations between the soviet union and the united states were driven by a complex interplay of ideological, political, and economic factors, which led to shifts between cautious cooperation and often bitter superpower rivalry over the years. the distinct differences in the political systems of the two countries often prevented them from reaching a mutual understanding on key policy issues and even, as in the case of the cuban missile crisis, brought them to the brink of war.

the united states government was initially hostile to the soviet leaders for taking russia out of world war i and was opposed to a state ideologically based on communism. although the united states embarked on a famine relief program in the soviet union in the early 1920s and american businessmen established commercial ties there during the period of the new economic policy (1921–29), the two countries did not establish diplomatic relations until 1933. by that time, the totalitarian nature of joseph stalin's regime presented an insurmountable obstacle to friendly relations with the west. although world war ii brought the two countries into alliance, based on the common aim of defeating nazi germany, the soviet union's aggressive, antidemocratic policy toward eastern europe had created tensions even before the war ended.

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