The practice or policy of expanding and extending the political power and economic control of a nation over another territory directly, mainly by territorial acquisition or by gaining indirect control over the political or economic life of that area. this is a paraphrased definition of which nineteenth century practice?

I believe that the system that is being spoken of is imperialism.

Imperialism is a nations desire to claim territory through economic control through both diplomatic and violent tactics. Although militarism has a very similar definition, it only relies on military control and not any diplomatic influence.

I hope this is what you’re looking for :)