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I think the following are true, but it would be worthwhile to chase down references from the History of Rhode Island:
I think the boundaries of Providence County are now the same as the original boundaries of the municipality of Providence, except for territory acquired from Massachusetts in the east. I think the animated map is inaccurate because it does not show this transfer.
I think Kent County follows the original boundary of Warwick, but I'm not sure about the Greenwiches. I don't think Warwick was part of the original colony of Rhode Island and Providence Plantations until 1663; it would be interesting to extend the map animation further back in history to show these early boundaries.
The history of Washington County, Rhode Island is a bit murky; I'm not sure what colony the original settlements were allied with, or what the originating municipality was.