Negotiation and allies before the basin
Cortés arrived on the Mexican coast in 1519 and sought supplies and support within local politics. Interpreters including Doña Marina conveyed messages across languages and interests. After conflict and negotiation, Tlaxcalans and others became allies, contributing personnel, provisions and knowledge of routes. Indigenous groups pursued their own goals within existing relations with the Mexica. Spanish movement inland consequently depended on translation, alliance and transport through a substantial regional political network.
Captivity and war within the lake city
After entering Tenochtitlan, the newcomers held Moctezuma captive and intervened in political and ritual activity. Conflict intensified in 1520, forcing a costly Spanish and allied withdrawal. Successor rulers organized resistance while smallpox killed residents and disrupted leadership and households. Cortés gathered further Indigenous support and prepared a siege. War increasingly damaged roads, markets, cultivation and supply, with both resistance and renewed attacks requiring substantial people and resources.
The siege of 1521 and colonial authority
In 1521, allied forces advanced across land and water, contesting causeways and disrupting supply. Residents faced hunger, disease and combat before Cuauhtémoc’s capture at the city’s fall. Colonial institutions reorganized tribute, land and religion; Indigenous allies continued seeking recognition of their contributions. Different accounts preserve victories and losses, while archaeology traces destruction and rebuilding. The end of the siege began a prolonged adjustment of authority in which local communities continued pursuing their relationships and interests.