Answer:
City-state, a political system consisting of an independent city having sovereignty over contiguous territory and serving as a centre and leader of political, economic, and cultural life.
(I don't know how it spreaded though, sorry :<)
He stated that <span>blacks should avoid integration, and embrace their own culture.
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After the Soviets successfully detonated an atomic bomb in 1949, President Harry S. Truman ordered the creation of a hydrogen bomb project. With the help of the Polish mathematician Stanislaw Ulam, Dr. Teller developed a model for the hydrogen bomb known as the Teller-Ulam design
Besides Neil Armstrong<span> and </span>Buzz Aldrin<span> – who were the first two astronauts to leave their boot prints on the Moon — there were also Pete Conrad, Alan Bean, Alan Shepard, Edgar Mitchell, David Scott, James Irwin, John Young, Charles Duke, </span>Eugene Cernan<span>, and Harrison Schmitt.</span>