Name the marine explorer who named the first ocean current.

Matthew Fontaine Maury

Explanation:

Matthew Fontaine Maury (January 14, 1806 – February 1, 1873) was an American astronomer, naval officer, historian, oceanographer, meteorologist, cartographer, author, geologist, and educator. Maury made many important new contributions to charting winds and ocean currents, including ocean lanes for passing ships at sea.

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.