Multiple choice Because nations built up their militaries to aid in their quest for empire, rival nations felt threatened and therefore also increased their military. many inventions were created to aid in this development. rival nations gave away territories they felt they couldn't hold on to. many nations immediately went to war with one another. Reveal answer Fill a bubble to check yourself A Correct answer Explanation Imperialism fueled competition for resources and territory. As nations expanded their militaries to protect their empires, rivals felt threatened and responded with their own military expansions.