WW1 pros and cons
Women’s rights. When the majority of men were off fighting in the war the women back home had to take over the work that was left vacant. Those in power gained popularity by appealing to the new demographic in society by granting rights to women they never had before.
Facilitated the second world war. The treaty of Versailles and the resulting borders in Europe created a geopolitical climate that gave birth to fascism and the spread of communism. These new conflicting ideologies would eventually clash in a conflict that would double the first war.
Democracy. Many empires fell as a result of the war and the turmoil the conflict causes motivated people to begin pushing for liberation and more say in how they live their lives. Dozens of nations that were governed by imperial empires formed into democratic governments.