More like more, by a lot, as in the entire population of Planet Earth, of which would now be split into the German and Japanese Empires - and that would be by ethnicity, not just territory (save for a few left for slavery purposes).
And that was just step 1, stopping those two.
That opened the door to step 2, bringing the entire planet out of the Middle Ages into the modern one you see now. Army Corps of Engineers even built canals in Afghanistan, of all places, in the 1950s so they can stop starving to death all the time.
And of course, they weren't the only ones who've been around for thousands of years ours had to swaddle and teach how to walk. Think about that, your grandparents were born into a world that was a donkey cart away from the Stone Age, and they later got light at the flick of a switch, communication beyond the Pony Express.
That was because of America, and wouldn't have been possible without the American Soldier.