Definitely: social organization of clans and tribes and moved around a lot. Might be livestock was only surplus if you mean that livestock was kept from season to season.
Answer:
The St. Lawrence is in the epicenter of "trade between the US and Canada"
Explanation:
This river flows in the border region between these two states. It is flows through the region where the Great Lakes are located. As we know this is the region where the largest part of trade between these two states is being done. River St. Lawrence is one of the largest and most important rivers in Canada. It is located in the eastern part of the country. It flows through the area where some of the most important cities such as Ottawa, Montreal and Quebec are located. It is also in the area near the US border.
For one, the Allies had an EXTREMELY massive amount of production, which the German's desperately lacked around the end of Operation Barbarossa in the East.
Also, relating to production, the German's air force (The Luftwaffe) and Naval forces were essentially non-existent by the time the Americans landed in Sicily, but the Allies had a surplus of air assets (specifically bombers and Airborne infantry) which solidified an Allied victory in Europe.