Stephen Douglas’s argument in this debate is known by what name

He demanded to know whether, in Douglas' opinion, the doctrine known as popular sovereignty would permit settlers to exclude slavery from a new territory before it became a state.

Explanation:

what are local authorities doing to fix the problem

explanation:

disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.