Based on documentation,
The only 2 African countries that were able to keep their freedom from European imperialism were;
B: Ethiopia and Liberia.
Ethiopia is currently the worlds oldest independent country and Liberia was founded to support the U.S. in relation to slavery in 1821.
I hope this has aided you and is sufficient.
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A major problem for the United States after the Revolutionary War (1775-1783) was that tens of thousands of Loyalists, due to the climate of violence and fear that still existed after the conflict (particularly in the South), fled the country, retreating with the British army to Britain and other parts of the British Empire (Jamaica, Bahamas, India) and also to Canada, settling primarily in the regions of Nova Scotia and New Brunswick. Since those Loyalists were often wealthy and educated, and they had been part of the thriving and cohesive upper class that controlled much of the industry and the commerce in areas such as New York or Boston, the social structure of the colonies changed significantly after their departure.
The soil, because it was rich for farming and it was right next to the mississippi river.
The chart shows that the railroad help expand the population of the cities