Why was Johnson picked as Lincoln's running mate in 1864?

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Johnson was chosen as Lincoln's running mate in 1864 to create a National Union ticket, which was a gesture of unity between Republicans and War Democrats. The Civil War was ongoing, and Lincoln wanted to signal that the entire country was united behind the war effort. Johnson was a Southern Democrat who had remained loyal to the Union and was seen as a symbol of the possibility of reconciliation between North and South after the war.

Why Was Johnson Picked as Lincoln's Running Mate in 1864