Brookline and Brooklyn

 https://en.wikipedia.org/wiki/Boston%E2%80%93Brookline_annexation_debate_of_1873 

https://www.boston.com/news/wickedpedia/2023/12/05/why-isnt-brookline-part-of-boston-1873-annexation/

https://en.wikipedia.org/wiki/Boston%E2%80%93Brookline_annexation_debate_of_1873#The_outcome 

https://www.bostonmagazine.com/news/2013/10/29/boston-annex-brookline-cambridge-somerville 

Brookline isn't any more likely to become part of Boston, than Brooklyn will be separating from NYC.

https://www.brownstoner.com/history/brooklyn-history-brooklyns-great-mistake 

https://keithyorkcity.wordpress.com/2012/10/05/the-great-mistake-of-1898-the-consolidation-of-a-dozen-towns-into-5-boroughs

https://www.thirteen.org/brooklyn/history/history3.html

https://nyc125.org/consolidation-timeline