Manifest Destiny is the belief that the US would one day expand across the whole American continent. So, with that in mind, it effected minorities because they were being pushed out of their lands as the US acquired the new territories.
Proponganda was important for the war efforts during World War I because people needed to passionate about the country they were fighting for. This is also known as Patriotism.
You wrote it yourself, “My Crazy Valentine”
How Far are you willing to go?