Why was it hard for the Aztecs to build the city of tenochtitland?

The Aztecs faced significant challenges in building Tenochtitlan due to its location on an island in Lake Texcoco, which made transportation and construction difficult. They had to develop innovative agricultural techniques, such as chinampas (floating gardens), to sustain their population. Additionally, the marshy terrain required extensive engineering to create solid foundations for their structures and ensure proper drainage. These challenges necessitated advanced planning and resource management to transform the area into a thriving urban center.