This is the 40th most frequent Polish word.
polsce
"Polsce" means "Poland" in the dative or locative case.
Here, 'Polsce' is the locative case of 'Polska', used to indicate location.
Mieszkam w Polsce od dziesięciu lat.
I have been living in Poland for ten years.
In this sentence, 'Polsce' in locative case denotes the place where the history being discussed pertains to.
Historia w Polsce jest bardzo interesująca.
History in Poland is very interesting.
Here, 'Polsce' is again the locative case, used to denote the place where the possibility of trying traditional dishes exists.