Answer:
Factors of WW1
MANIA or MAIN
M - Militarism, the reliance of military strength, having a stronger and better military
A - Alliances - mutual agreements between countries
N - Nationalism, taking pride in one's country
I - Imperialism, taking economic control over a weaker country or nation
A - Assassination of Archduke Franz Ferdinand of Austria, the spark that triggered and causing the war
The war began in 1914 and lasted until 1918.