What would be the impact on population be as a result of the following not happening -
1 No World War 1, I presume a higher European population today and of course there would have been no World War 2, The Spanish Flu still happens, though it almost certainly had its origins in the trenches.
2 No World War 2, what would be its impact on Europe's and the world's population today, I'm presuming a WW2 in this scenario. Is there any possibility that it could actually be smaller as there will be no post war boom?
3 No direct US military involvement in Vietnam has what impact on the US population today?