They faced the rivers.
OR
Moses and Abraham followed rivers and seas.
One key difference between the people can be the culture based on immigration origin. Most people in the south originate from colonies that used to be Spanish so there's a lot of Spanish cultural influence and Mexican while northerners are mostly of Germanic origin. One difference in economy is for example agricultural. Northern parts have harsher climate so things like tobacco can't grow as successfully while southerners have very dry and hot lands where you don't have dense coniferous forests.
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the answer is A. it provides context
The answer is A.)they reopened trade with the middle east during the 14th century.
King had a non-violence movement. They did things like sit in, practiced civil disobedience, and etc. When the police arrested them or acted violently towards them they would resist or fight back. This movement was successful.
The Black Power movement deals with violence. they thought that Kings way of getting rights was not helping so they took matter in their own hands and did things violently. This is why their movement wasn't successful.