Conversation so far:
When was the Russian colonial period?
Arriving from Siberia by ship in the mid-eighteenth century, Russians began to trade with Alaska Natives.
What did they trade?
Rather than hunting the marine life, the Russians forced the Aleuts to do the work for them.
What did  they hunt?
CANNOTANSWER.

Question: What else was significant during the Russian colonial period?
Self-contained rewrite: What else was significant during the Russian colonial period other than forcing Aletus to do work for Russians?