I believe most US States have granted far more autonomy than Canadian Provinces to cities. It has been my understanding that most municipal amalgamations in Ontario at least were not done willingly. The local councils/mayors/police chiefs/and event citizen didn't like the idea -- but their opinions were of less importance since the decisions were made on a provincial level.
I do wonder about Jacksonville FL or Indianapolis IN. Both are examples of very large cities. Perhaps state law there is different?
The US is after all the United STATES -- and as such the States have much more power and many more differences than Canadian Provinces do. The relationship between States is more like the relationship of the rest of Canada to the 'Distinct Society' of Quebec where they run a separate pension plan, immigration rules, voting requirements, etc.
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