Why did the east african city-states become important trading centers?

The city-states along the eastern coast of Africa made ideal centers of trade. An important attraction was the gold obtained from inland kingdoms. The gold was needed mainly for coins, although it was also used for works of art, ornamentation on buildings, and jewelry.

ok, so basically your gonna start with 350 ok. so there's 60 seconds in a minute so that means you he can go up 10 ft per minute. soo, after 3 minutes he should be at 260 ft after three minutes : )

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the articles of confederation placed most of the power on the feds