bring a lawsuit
... that a U.S. appeals court declared the federal government was obliged to bring a lawsuit against the state of Maine, claiming 60% of the state's land on behalf of the Passamaquoddy and Penobscot?
... that a <a href="./United_States_Court_of_Appeals_for_the_First_Circuit" id="mwCNE" rel="mw:WikiLink" title="United States Court of Appeals for the First Circuit">U.S. appeals court</a> declared the federal government was obliged to <b id="mwCNI"><a href="./Joint_Tribal_Council_of_the_Passamaquoddy_Tribe_v._Morton" id="mwCNM" rel="mw:WikiLink" title="Joint Tribal Council of the Passamaquoddy Tribe v. Morton">bring a lawsuit</a></b> against the state of <a href="./Maine" id="mwCNQ" rel="mw:WikiLink" title="Maine">Maine</a>, claiming 60% of the state's land on behalf of the <a class="mw-redirect" href="./Passamaquoddy_people" id="mwCNU" rel="mw:WikiLink" title="Passamaquoddy people">Passamaquoddy</a> and <a class="mw-redirect" href="./Penobscot_people" id="mwCNY" rel="mw:WikiLink" title="Penobscot people">Penobscot</a>?