This governmental position is both a member of the Executive Branch and is also the Constitutional leader of the U. S. Senate.

The vice president.

Explanation:

Under the Constitution, the vice president serves as the president of the Senate and presides over the Senate's daily proceedings. In the absence of the vice president, the Senate's president pro tempore (and others designated by him) presides.

the group i'm selecting: greeks.

a first group of greek immigrants came to the us in the 1850s. the second group came to america starting in the 1890s due to economic opportunities they didn't have back in their home caused by the hardships of ottoman rule. greek immigration was 90% male, many of them expected to work and return to greece after earning enough capital, but ultimately had to remain in the us after the greek genocide.