Sentence:  States were free to enact , within broad though ( perhaps ) determinate limits , their <WSD>own</WSD> rules as to the application of foreign law by their courts , to vary the law merchant , and to enact legislation with regard to many claims arising on the high seas . 
Meaning of the word marked with <WSD> tags:  belonging to or on behalf of a specified person (especially yourself); preceded by a possessive