The African empires remained largely as traditionalists and agriculturists. They stayed in their territories working hard to achieve progress. The Swahili city-states were traders and craftsmen. Their culture had been influenced by Middle-Easters and Indian territories. They were able to make dealings with overseas territories which helped them increase their economy.
Generally speaking, from the 1830s on, people hoping to settle in the Northwest "B-traveled along the Oregon Trail," since this had become a well-established route.