How do nationalism imperialism militarism and industrialization lead to conflict?

Nationalism is pride in ones country , imperialism is a policy of extending a country’s power and influence through diplomacy or military force. militarism is a belief or desire of govt , or the people that a country should maintain a strong military capability and be prepared to use it aggressively to defend or promote national interests. now using these philosophies and opinions i’ve acquired by knowledge they lead to conflicts such as wwi and many battles and war later on in the story of history due to others beliefs and opinions and how most people view the world