Kilwa had seized the port of Sofala, which was a trading center for gold mined inland. By controlling Sofala, Kilwa was able to con- trol the overseas trade of gold from southern Africa. As a result, Kilwa became the wealthiest, most powerful coastal city-state.
5 because 1250 divided by 250 equals 5 so that is how many times it goes in.
Well, the earliest war during the twentieth century was World War I, but if you're asking about 1900 specifically, I'm not sure if there was any officially declared war that the United States was involved in. Later, World War II and the Korean and Vietnam Wars ensued.
Eli Whitney inventing the cotton gin which separated cotton seeds from their fiber and also increased the cotton supply in the south. Another event is the first national road to link parts of the country together to transport and increase trade throughout the United States.