<span>Copernicus posited a heliocentric or sun-centered conception of the universe; Kepler contributed the three laws of planetary motion; and Galileo's telescope led to observations of earth like planets rather than ethereal planets.</span>
Answer:
the olmecas settled down in 400 b.c.
Julius and Ethel Rosenberg were Jewish American citizens who were convicted, with others, of conspiracy for espionage on behalf of the Soviet Union in the late 1940s, when it was an ally of the United States during World War II. They were tried, convicted, and executed by the federal government of the United States.
It began a decade long boom.
This was known as the Roaring Twenties :)
The answer is C. The new forms of communication such as phones and morse code improve communications. The railroad and steamboat improved transportation.
