Our view on war changes over time. Besides war, it can not affect society. War can be regarded as noble and justice, cruel and inhuman, and everything in between. War affects everyone in society whether they are fighting in a foreign country or waiting for their loved ones to go home. War is an indispensable part of civilization, which can be found in every chapter of human history. This is the climax of the basic survival instinct when provoked. Just like battle skills, the perception of society's war has changed.
The foreign policy of the United States changed over time, reflecting the change in its national interests. As a new country after the revolutionary war, the main national interest of the United States is to maintain independence from more powerful European countries. Under the protection of the Atlantic Ocean, the main foreign policy represented by Monroe is to limit the European attempt to further colonize the Western Hemisphere. By the beginning of the 20th century the United States fought against Spain for the war between Cuba and the Philippines and merged with Hawaii and some other territories to become secondary empire groups. World War I involved the United States as a problem of Europe, but after the war the waves of isolationism spread all over the country. The US refused to join the League of Nations and turned inward again. Following the prosperity of the 1920s and the Great Depression of the 1930s, America eroded its military power.
In the 1950s, America was regarded as one of the most powerful countries in the world. America has established itself as a powerful military power and a dominant country in the Second World War. The influence of World War II continued in the 1950s, and there were many baby booms in the United States due to a lot of economic growth, an increase in the number of migrants to the suburbs, and a return to the house of millions of soldiers. - Families have always been expected to be a thoughtful environment with support and communication, but sometimes it may not become parent immediately. There are also people specializing in bad things, and their growth is probably a cause or individuals may bear all responsibility. When society chooses something acceptable to society, it only restricts relatives to one family, the purpose destroys all other kinds.