How did the New Imperialism lead to World War 1?
countries felt threatned by one another and began to attack and take over one another's territories. Economic, political, and cultural domination of nations by stronger nations contributed to the outbreak of war because it lead to disputes over territory between countries.
Imperialism was actually the big thing. So many countries wanted to expand and gain new territories and colonies (imperialism) that it lead to disputes between countries: the imperialistic one and the one getting taken over. Many countries already had alliences with others, so when two countries started fighting, their allies got involved. Then THEIR allies got involved, and so on and so forth.