The correct answer is the third. Mountain men played a decisive role in the opening of the different routes, allowing the Eastern Americans to settle in the new territories of the Far West with organized caravans that traveled along the roads explored and physically improved by those mountain men and the great companies of the fur trade.
On a hot day, the air particles are farther away from each other, and moving very quickly, bouncing off of one another. On a cold day, the particles are more compact and move much less quickly.
Once Germany invaded Czechoslovakia and then signed the German-Soviet Non Aggression Pact. At this point (end 1939) Hitler has proof of the might of his Military and now only had to worry about France and Britain to the West. The pact effectively took the Soviet Union off the board and Hitler didn’t have to worry about the East and being attacked from two directions.
I’m sorry, who are we talking about?
C. Hiring an army of foreign mercenary soldiers and copying the way of waging war that he saw among the Ottomans.