The north would either surrender or negotiate a peace agreement that let the confederacy be independent
"Reconstruction" is actually has a double meaning: in addition to the physical act of rebuilding areas of the South is also refers to federal government intervention in the former Confederate states in order to monitor the treatment of former slaves. This period lasted until 1877.
In just twelve years, Alexander the Great conquered vast territories and dominated lands from west of the Nile to east of the Indus. He brought the Persian Empire, Egypt and much of the Middle East under his control.
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