It adds emphasis to that phrase, and implies a deeper meaning
I'm assuming you'ret talking about either WWII or WWI, but it's the same concept. They made sure everybody knew about it. Posters were everywhere letting people know about their fellow Americans in the war and to donate lots of money and supplies.
Hope this helps!!
If the war never happened many unnecessary deaths could've been avoided. Also the public would've probably had more support for the president.
