The foreign policy position most associated with aggression and war is:
-imperialism
-isolationism
-interventionism
-internationalism

To answer this question lets take a look in each option:

Imperialism - It has several different significations, but it is more related to the system when a country rules other countries. It can be politically, economically or even socially. In several cases relying on force and violence to achieve its goals;

Isolationism  - Can be seen as a national policy of avoiding any political or economic involvements with other countries. It is when a country attempts to achieve its own development without relying on any foreign nation.

Interventionism  - Is the attempt of the state to influence a political, economical or social sphere which is not directly under its control.

Internationalism - It is the total contrary of the isolationism, it advocates the political and economical cooperation between nations in order to achieve an international good.

As a result, the foreign policy position most associated with aggression and war is imperialism.

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