The hostilities between two racial subgroups of a riverfront community were dramatically reduced when the threat of their river flooding its banks required that they work together to save their town. This best illustrates the impact of .

superordinate goals

Explanation:

Superordinate goals -

It refers to the collective goals which is very crucial and necessary to complete by using two or more social groups , is referred to as superordinate goals .

The method requires a lot of unity and cooperation of people in order to accomplish the goal .

Hence , from the given scenario of the question ,

The correct answer is superordinate goals .

the answer is d. amendments.

answer; self_ disclosure;