Expert Guidance on Archival Footage for Redlining-Gentrification Documentary

Need help with archival footage about redlining and gentrification I wrapped on filming interviews for a documentary about gentrification and redlining and how that impacted the lives of older people today. I cannot film in that city anymore since I moved and I want to use archival footage as B roll but I am trying to decide what would best to include. Any ideas on what I should include or where I can get footage from? I am using national archives and internet archives. I would love some help!