Which of the following is a reason why few people live in Siberia?

A.
The long distances between cities create isolation.

B.
The permafrost makes the construction of roads and buildings difficult.

C.
The region has several active volcanoes and frequent earthquakes.

D.
Most of the region is off-limits to settlement to protect its natural resources.

B

Explanation:

permafrost makes construction difficult, as well as the inability to plant/farm, or grow food

in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

explanation:

a direct vote in which an entire electorate is invited to vote on a particular proposal. this may result in the adoption of a new law.