How did Germany increase its power in the late 1800s?

It became an industrial giant.

It promoted the idea of socialism.

It built a navy to compete with Britain.

It allied with the Catholic Church.

It became an industrial giant.

Well, Germany grew in power and in size since Germany was one of the biggest steal importers of the world back in those times. Germany produced the finest metal around. But that's only one part of it, the real true part of this answer is that Germany grew this way because it became an industrial giant.