Final answer:
Jean Jackson, an anthropologist, did not study Brazilian city expansion but has made significant contributions to the field, particularly with her research on the Tukanoans in Northwest Amazonia and indigenous movements in Colombia.
Step-by-step explanation:
Jean Jackson's publications did not focus on the expansion of cities in Brazil; this assertion is false.
Jean Jackson is a prominent anthropologist known for conducting fieldwork primarily in the Northwest Amazonia and Colombia. Her notable work includes 'The Fish People: Linguistic Exogamy and Tukanoan Identity in Northwest Amazonia', which explores the intersection of language and identity among the indigenous Tukanoans. Jackson has contributed to the understanding of the Colombian indigenous peoples' movement through her article published in 1989, which was a significant English language piece on the topic. Her research also encompasses the impact of missionaries, the Colombian conflict, and rights-claiming discourse, reflecting her anthropological acumen in analyzing cultural and social dynamics within indigenous communities.