Which of the following is an example of hierarchical diffusion?
1. a brand of sunglasses becomes popular after a soccer star is seen wearing them.
2. an illegal immigrant is deported from the united states.
3. many computer makers start to use the same type of user interface.
4. a popular cell-phone ringtone becomes popular around the world.

the hollywood film industry of 1950 was threatened on several different fronts. television broadcasting was rapidly becoming the dominant entertainment medium in the united states. the paramount anti-trust consent decree requiring separate ownership for production companies and theater chains had gone into effect on 1 january 1950. large numbers of young men and women were marrying, having children, and moving to the suburbs, which affected the viability of downtown first-run movie theaters. foreign revenues were endangered by protectionist tactics including quota systems, high taxes, and blocked funds. finally, the morality and patriotism of hollywood films and filmmakers were under attack from government, religious, and citizens' groups.

explanation:

to act quickly in times of danger to the united states

because you have to act quickly if you want to live/survive.