What role did propaganda play in imperialism?

A huge role, on every side. The us printed off thousands upon thousands of anti-german posters, along with having military style parades and marches through large cities. Britain, Germany, and France all did the same, except they took it a little further by indoctrinating their school children in hateful rhetoric about the enemy. Not to mention Britain used bishops of the anglican church as agents to spread hate amongst their congregations and perishss. It got quite out of hand.