Characters frequently struggle between their personal affections and their responsibilities to their tribe, empire, or family traditions. Romantic Tropes in Historical Settings 7 Female Love Interests | Author J.S. Morin
Many pre-Columbian societies, such as the Inca and Aztec, utilized marriage as a tool for diplomacy and cementing control between noble families.
If you are looking for romance and relationship dynamics set in or inspired by this historical period, Common Relationship Dynamics
Storylines often explore the tension between individuals from different social castes, such as a commoner falling for a noble "princess" figure.
While the book by Charles C. Mann is a non-fiction historical work and does not contain romantic storylines or fictional relationships, its detailed account of pre-Columbian civilizations offers a rich foundation for understanding real-world social and political structures of that era.