It is very easy to move opinions of a mass population if you have time and money to throw at it
Most wars if not all from US are flase flag attacks. Because of big profits for the wealthy, very little to do with justice. What war has been a just war? Look at China no major war since 1976. Today you will find most Americans don't want war, they do it anyway. Like the election it is not a demoncracy anymore.
The politicians definitely use the media to rile up support for wars...
I don't think it was any different for the older wars, just different media.
The Spanish and Mexican war are the only wars America has won.
Since the birth of the USA on July 4, 1776 with the Declaration of Independence, the country has been at war for 93% of its existence. It all started with the American War of Independence from 1775 to 1783. Now, to most Americans that conflict was more than necessary.