<span>The first major city in sumer was Ur</span>
Why was the invention of the idea of citizenship important to the development of democracy?
The most highly developed geocentric model was that of Ptolemy of Alexandria (2nd century ce). It was generally accepted until the 16th century, after which it was superseded by heliocentric models such as that of Nicolaus Copernicus.
The best options from the list would be that "b. The Portuguese and Spanish were the first Europeans to seek Africans slaves to work in their colonies," and "<span>d. During the 1500s, African slave traders began to sell slaves for the Americas rather than for Muslim lands to the north and east," since this was more profitable. </span>
