Previously we tried to explain how Japan became an imperial power. One of the reason was that the period from 1871 (after the unification of Germany in the Franco-Prussian Wars) till 1914 was a time of new imperialism. This race for territories, and increased global militarism necessary to secure new territories, was arguably one of the reasons contributing to the outbreak of WWI.
Find out more about the scale of imperialism from the map below:
Credit: http://highered.mcgraw-hill.com/sites/0072957549/student_view0/chapter39/interactive_map_quiz.html