Imperial competition also pushed the countries towards adopting alliances. Colonies were units of exchange that could be bargained without significantly affecting the metro-pole. They also brought nations who would otherwise not interact into conflict and agreement. For example, the Russo-Japanese War (1905) over aspirations in China, helped bring the Triple Entente into being.
It has been suggested that Germany was motivated by imperial ambitions to invade Belgium and France. Certainly the expansion of the British and French empires, fired by the rise of industrialism and the pursuit of new markets, caused some resentment in Germany, and the pursuit of a short, aborted imperial policy in the late nineteenth century.