They rebelled against his policies
Herbert Hoover lost by a narrow margin
The Black Power movement led by Malcom X had ideas similar to King's movement, being that they both wanted rights for African-Americans, but the way they protested is where they differed. Malcom X criticized MLK's method of peaceful protest, and took to having a more radical and violent way of protest and fighting back against oppression. I hope this helps :)
A. The strategies that are used in propaganda were mass media and atrocity propaganda. Atrocity propaganda is the most effective since it creates hate.
b. Propaganda is beneficial in a way that it develops patriotism however it may result to more violent actions.
c. Nowadays, the bandwagon propaganda is being used especially in advertising.