Answer:
The industrial revolution was the force behind this New Imperialism, as it created not only the need for Europe to expand, but the power to successfully take and profitably maintain so many colonies overseas. The industrial revolution created the need for Europe to take over colonies around the world.
It was all of these countries that allied with Austria-Hungary during World War I. It was this complex system of alliances that had formed in the early 1900s that was partially responsible for WWI.
