The magnitude of an object's charge can either increase or decrease the attraction/ repulsion between another object. The larger the difference of the two object's charges, the stronger opposite charges attract, and the stronger like charges repel.
The type of decision that increases a nation's sphere of influence is called an Expansionist policy. This is a form of an aggressive and radical nationalism where expansionism is the main goal. Expansion in terms of military and economic context that caused a lot of major conflicts and colonization in history.