Answer: 2) Nomadic lifestyle of Native American plains dwellers
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Answer number 2 is the only one that is most likely due to climate variations. Climate variation did not cause the discover of gold. Growth of Puritan religious influences was not caused by climate, but more of a spread of the idea throughout colonial America over time. The flow of the Mississippi south is because rivers flow downhill with gravity, and is not affected by climate.
However, the plains Indians were nomadic mainly because they follow the migration of buffalo. The buffalo migrated due to seasonal variations as they followed their food source. This makes answer 2 the best answer.
This would be known as the Proclamation of Neutrality. France declared war on Britain during what was known as the French Revolution. The French called for American support, but Washington refused. This would be reflected in Washington's Farewell Address when he called for the avoidance of foreign intervention from the United States.
Russia defeated Napoleon by starving and freezing his army to death. During the invasion, French troops were forced to march through miles of snow in extremely cold weather, without the proper clothing and supplies to survive it. The Russians purposefully burned down their own villages so that the French could not raid them for supplies. By the time Napoleon reached Moscow, his army's morale was extremely low and he had sustained heavy losses, and he was forced to retreat soon afterward. Russia's cold weather that makes it almost impossible to invade is often called 'Russian Winter' or 'General Winter'.
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The answer to this question is GeorgiaHope this helps :)