The unassigned lands were a byproduct of treaties with the tribes in the year
a.
choctaw and chickasaw . . 1897
b.
creek and seminole . . 1866
c.
chickasaw and cherokee . . 1897
d.
choctaw and cherokee . . 1866

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.

it should be a. song dynasty’s civil service examination system created an administrative bureaucracy manned by the landed aristocracy.