Why lincoln links victory in the civil war to preserving “government of the people, by the people, and for the people”?

Explanation:

Like many human-rights appeals, it sounded good but did not actually mean much. ("Government by the people"??)

He was really talking about freeing the slaves and extending the vote.

The main cause of the Civil War was the issue of slavery. The Union had an abolitionist position, whereas the Confederacy stood for the remanence of Slavery. 

In the end, the Union resulted victorious in 1865 and President Lincoln abolished slavery, stating that that was the starting point for the country in which al human beings would be considered as equals. 

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