How does President Obama use logic to make his claim?.

"harry t. moore (1905-1951) – civil rights activist, leader, and the first martyr of the civil rights movement. fannie lou hamer (1917–1977) – leader in the american civil rights movement; co-founder of the national women's political caucus and freedom democratic party. james farmer (1920–1999) – congress of racial equality."

permafrost layer, it exists beneath a layer of soil, rock or sediment.

answer; one person; monarch;