I agree that acquiescence is a peculiar method to determine boundaries. I do not buy it for the modern deeds, but I will accept it wholeheartedly for ancient deeds.
Look at all the ancient deeds that contained descriptions of long straight lines. Now find the monuments and you will not find long, straight lines; you would find little angle points along a segmented line. Presumably, one would not return to those original lines, they would hold the monuments. How did the line change? Acquiescence is a perfect explanation.
> So, does a court decision in a boundary dispute convey or transfer title to the land to the determined boundary line? Does the decree complete the so called unwritten transfer of title and actually convey land from one party to the other?
No, not by it's self:
Some court decrees include an order compelling the execution of documents that do convey title. I do know of a few that did.
This is something a knowable and competent Attorney will include in the pleadings.
Courts answer questions and make determinations based on what is presented, nothing more that that.
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