Final answer:
Cross cousin marriages in some societies are indeed conducted to establish political alliances, a practice that is true and has historical and social significance.
Step-by-step explanation:
The statement that in some societies, cross cousin marriages are conducted in order to establish political alliances with other communities is true. Such practices serve not only to solidify relationships between different kinship groups but also to strengthen social and political bonds. For example, marriage in tribal communities can be a strategy to maintain or raise the percentage of blood quantum in their offspring, which can affect tribal membership eligibility, as mentioned by scholars like Nenemay (2005) and Thornton (1997). Similarly, in historical contexts, the formation of alliances through kinship and marriage facilitated the dissemination of power and territorial expansion, as seen in the alliances between Indian tribes and European empires.