As the title says is there a place where I can find a history of changes to the API?
The API I am talking about is here: https://api.stackexchange.com/
I want something more detailed than what is shown in the What's New page.
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You can find the official history in the API docs "Change Log".
Note that the "log" is very sparse, does not include every significant build, nor bug fixes nor feature requests. A lot of changes are made silently -- including API version 2.3.
Also note that that "Change Log" omits version 1 and earlier of the API. You can find some of that in the API v1.x Shutdown timeline.