What cultures were affected by the territorial acquisition

The cultures that would be the affected would be the existing culture of the territories that was acquired by the new ruler or nation and in some cases the new owner of the territory acquired. It would be affected because it need to adjust in the new norms and cultures that transcend whether it is the culture of majority or minority and both need to compromise to provide satisfactory results on all sides.

Avoid political parties don’t form foreign alliances and social reform

That really sucks, but i don't know who your leader is, and i don't want to write that much