Final answer:
Intermarriages and cultural influences of Indigenous populations, as well as the support and inspiration from the Catholic Church, fostered the development of Modernist Native American Art.
Step-by-step explanation:
Two of the three things that fostered the development of Modernist Native American Art are:
- Intermarriages and the cultural influences of Indigenous populations, which changed the aesthetics of tradition into new models of art, pictorial styles, ornamentation, and structural formats.
- The Catholic Church's support and inspiration for creative work in Mexico, providing a wealth of ideas and iconic images from biblical stories and church heroes.