When mankind can live to 200 years wars will be way less prevalent.
Slavery abolished sans Civil War?
The sociology of greatly increased life spans is fascinating to contemplate.
It becomes seriously difficult to rewrite history. Would the founding fathers have not stopped FDR? Prohibition? WOsomeD? "the right of the people to keep and bear Arms, shall not be infringed."? Income tax?
One sort of has to go forward with their speculations.