why is the mexican-american war considered "the last war of humanity"??
i was wondering about that, i mean technically it could be considered the last war because it was before the modern era (1900) and yes,i know about world war and etc but what i mean is that the mexican-american war was the last one that didn't have a lot of planning into it, similar to wars in the older days,,like there was no system control back then or like radio so technically, while not true, could it be considered "the last war of humanity"?
It might seem like there was an "old days" in war compared to modern times but technology in war has always been continuously improving and has often been the decisive factor.
In the America-Mexico war the Americans had a distinct technological advantage being able to use the newer and more accurate 1841 Springfield rifle. They also had superior artillery technology.
If you mean the "old days" as in mass troop movement on the field and hand to hand fighting and no computers then there was plenty of that all over Europe and elsewhere later in the 1800s all the way up to WWI.
I don't have a complete answer, but the mechanization of warfare should have a lot to do with it. Things like the semi-automatic pistol -- they would have called it an "automatic" pistol during that era -- the modern hand grenade, the airplane for reconnaissance (although lighter-than-air balloons might have been used? IDK), and other weapons wouldn't have really appeared for the Mexican-American War (1846-1848).
Or did you mean the Spanish-American War (1898)? I think the same logic still stands, especially since train networks would have been more fully developed by the turn of the century.