Final answer:
The movement to legitimize and consolidate Native painting as a larger movement involved successful joint exhibitions of impressionistic paintings promoting Native art in the Western world. This led to the creation of professional funds and marketing strategies, transforming indigenous art from a marginalized to a recognized form.
Step-by-step explanation:
The event that was significant in legitimizing and consolidating Native painting as a larger movement, according to scholars like Berlo and Phillips, was not explicitly stated in the provided excerpts. However, within the context of the presented texts, it is clear that the successful joint exhibitions of an impressionistic style of painting by a group seeking to recognize and promote Native Peoples art in the Western art world played a pivotal role. This movement sought to transform indigenous art from a marginalized form to one with recognized modern artistic value, establishing funds and strategies to support Native artists in pursuing art professionally and market their works widely, thus paving the way for future generations.
In the late 19th and early 20th centuries, Native American art began to change dramatically in response to cultural upheavals, such as forced relocations and reservations. The artworks from this period reflect a fusion of Native traditions with European influences, a topic that some might argue affects their authenticity. Nonetheless, it is essential to value these pieces as culturally significant responses to new, often challenging, circumstances.