Effective communication is important because it helps to prevent and deal with conflicts. If one person wants something, and if they don't communicate it to the others, it might lead to a situation in which the others refuse then this without knowing, which would lead to conflicts.
So, in short: communication serves to prevent and lessen conflicts.
Members of congress often resist taking action to limit presidential power because if they belong to the same party, they would not want to interfere with the actions of the president, for sharing the same ideals and the same political objectives, usually the majority is sought in the congress to act with greater freedom with respect to the state policy proposed by the president.
<span>This phenomenon would illustrate deindividuation. Deindividuation is when a person joins a group and then takes on the group's identity and behavioral attitudes. The person might then carry out actions or take certain view points that the group has even though it is something they would not normally do by themselves.</span>
"<span>Military power shifted away from European nations" is the best option since it was this very military power that allowed the European nations to be so dominating.</span>
