Should a president die in office, which official succeeds the president if the vice president is unable to assume the role

If the President dies in office and the Vice President is unable to assume the role, this is assumed by the Speaker of the House of Representatives.

Explanation:

The Speaker of the House is the presiding member of the House of Representatives. Under the United States Constitution, the Speaker of the House is the second person after the Vice President to replace the President if he is unable to exercise his office, for whatever reason. The Speaker does not supervise the ordinary meetings of the House; his role is more or less administrative.   The current Speaker of the House since January 2019 is Democrat Nancy Pelosi.

as general terms,  indian territory,  the indian territories, or  indian country  describe an evolving land area set aside by the  united states government  for the relocation of  native americans  who held  aboriginal title  to their land. in general, the tribes ceded land they occupied in exchange for  land grants  in 1803. the concept of an indian territory was an outcome of the 18th- and 19th-century policy of  indian removal. after the  civil war(1861–1865), the policy of the government was one of  assimilation.