Finding Dates for USA Places

Question

See https://digital.newberry.org/ahcb/ to identify dates for states, territories, and counties in the USA.

Apologies if this is a repeat,

Comments

This is a fantastic reference!

They even have each source for each boundary and a general discussion of the history of changes.

As a retired professional in the field of cartography and computing, working in the field about the time that work started on this atlas, and active in defining cartographic database content and structure, this atlas really impresses me.

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When you comment and don't answer, I can't give you the star you deserve