How did economic competition and imperialism cause wwi

Imperialism was one of the four contributing factors to the cause of World War One, along with secret alliances, militarism, and nationalism. It is the most important cause of WW1, because it created a build-up of tension in Europe and outside of Europe, and through imperialism, the three other causes were able to affect the beginnings of the war.

the correct answer is =   british soldiers attacked and killed five boston townspeople.