Militarism- The belief that a strong military is important to defend the country it's assigned to. It will be used to defend and promote the interests of that nation.
Alliances- countries coming together to form an agreement between eachother to wage war against other alliances
Imperialism- When countries take land for reasources and labor units for thair benefit. A period in which white rich men pitied the poorer class had happened and it only made things worse and frusterating for people.
I hate your country 'cuz mine's better
Nationalism- The act of defending your nation with hatred for other nations. The hate for other poeple comes before loving their own nation.