1.Economics
Economics played one of the most key roles throughout the 20th century. From the great depression and war reparations to assembly lines and industrialization,Economics helped mend and create many of the conflicts seen.
2.Role of Women
Women made great advancements in this time for their rights, but also for freedom from the constraints of men. They gained more knowledge and job opportunities which in turn let them have more control once men returned from war on when they wanted to have children and how the family dynamic would work.
3.Ideologies
The ideologies seen throughout the 20th century created many of the conflicts we've seen. Most of the time it is one trying to eliminate or overpower the other.
4.Religion
Religion started many of the battles; from the holocaust to the conflict in the Middle East. Religion to this day remains a sour point between nations.
5.Nationalism
Nationalism was one of the techniques that countries used time and time again to show their unity in times of turmoil. From banning together instead of breaking apart they had triumphs in desperation.
6.Social Conflict/Culture
The Apartheid, anti-semitism and the rise of communism are all examples of how when a country does not band together they get torn apart much faster. Social conflict based on culture and other differences had great impacts on how society changed for the better and the worse.
7.Discrimination
Discrimination throughout time has proved to be a key role in conflict. From the Holocaust to the racism against black people, many people lost their lives on the road to trying to eliminate this prejudice.
8.Collective Security
The league of nations and united nations were two forms of collective security that were for the most part quite effective. The league of nations failed due to the fact that they did not have enough support but the United nations is still a strong form of security to this day.
9.Politics
NATO,USSR and Isolationism were examples of how politics in the times worked. Isolationism was not a successful example but NATO was a successful form.
10.Technologie
Technologie was and is an ever changing field. It is growing as our needs and demands ask for it, in the 20th century we saw mostly war weapon advancements such as jet planes, submarines and satellites. These advancements achieved great things, but sadly destruction was one of these.
11.Role of Individuals
Their were some outstanding individuals in the 20th century. From Margaret Thatcher, Rosa Parks and Martin luther King Jr. who fought for the rights for others. To some who fought for their own greed and needs like Hitler and Saddam Hussein. All these individuals played key roles in the 20th century.
12.Military Conflict
Military conflicts had great destruction and loss. From WWII, the atomic bomb and and Vietnam. Some conflicts were provoked but some were just started out of confusion. Both had the same sad outcome of losing innocent men and women.