a sentence

xionghuixh

Though these maps incorporate some information gleaned directly from
Native Americans, rarely has Native American cartography contributed to this official record,
which has been compiled, surveyed, and authenticated by non-Native American tribes and their
migrations and cultural features, as well as territoriality and contemporary trust lands, reflects the
origins of the data, the mixed purposes for which the maps have been prepared, and changes both I
United States government policy and in non-Native Americans’ attitudes toward an understanding
of Native Americans.

reflects ,changes 的主语是不是this official record?

wangyu73cn

我同意楼主的意见，reflects ,changes 的主语是this official record。