ix ie ). ▁ ▁Background ▁ ▁Maryland ' s ▁char ter ▁of ▁ 1 6 3 2 ▁granted ▁the ▁Cal ver ts ▁land ▁north ▁of ▁the ▁entire ▁length ▁of ▁the ▁Pot om ac ▁River ▁up ▁to ▁the ▁ 4 0 th ▁parallel . ▁A ▁problem ▁arose ▁when ▁Charles ▁II ▁granted ▁a ▁char ter ▁for ▁Pennsylvania ▁in ▁ 1 6 8 1 . ▁The ▁grant ▁defined ▁Pennsylvania ' s ▁southern ▁border ▁as ▁identical ▁to ▁Maryland ' s ▁northern ▁border , ▁but ▁described ▁it ▁differently , ▁as ▁Charles ▁re lied ▁on ▁an ▁in ac cur ate ▁map . ▁The ▁terms ▁of ▁the ▁grant ▁clearly ▁indicate ▁that ▁Charles ▁II ▁and ▁William ▁P enn ▁believed ▁the ▁ 4 0 th ▁parallel ▁would ▁intersect ▁the ▁Tw elve - M ile ▁Circle ▁around ▁New ▁Castle , ▁Del aware , ▁when ▁in ▁fact ▁it ▁falls ▁north ▁of ▁the ▁original ▁boundaries ▁of ▁the ▁City ▁of ▁Philadelphia , ▁the ▁site ▁of ▁which ▁P enn ▁had ▁already ▁selected ▁for ▁his ▁col ony ' s ▁capital ▁city . ▁Neg oti ations ▁en su ed ▁after ▁the ▁problem ▁was ▁discovered ▁in ▁ 1 6 8 1 . ▁A ▁comprom ise ▁proposed ▁by ▁Charles ▁II ▁in ▁ 1 6 8 2 , ▁which ▁might ▁have ▁resolved ▁the ▁issue , ▁was ▁und erm ined ▁by ▁P enn ▁receiving ▁the ▁additional ▁grant ▁of ▁the ▁" Three ▁Lower ▁Count ies " ▁along ▁Del aware ▁Bay , ▁which ▁later ▁became ▁the ▁Del aware ▁Col ony , ▁a ▁satellite ▁of ▁Pennsylvania . ▁Maryland ▁considered ▁these ▁lands ▁part ▁of ▁its ▁original ▁grant