The disruption in Atlantic shipping prior to and during the War of 1812 increased the manufacturing and this was the way it affected the United States economy. Since there was problem in importing products, so to balance it, the internal production was increased and this way the economy sustained that period.
The cold weather and winter
Operation Barbarossa was the Nazi German military invasion of the "USSR", since this was the famous surprise attack by Germany that broke the Nazi-Soviet Pact in World War II.
A- cash crops such as tobacco required many workers.