Economic development in Europe during the 15th and 16th centuries led to renewed technological and scientific development throughout Europe which continued into the centuries after. New wealth, advancements in ship building, desire for new trade routes, and a greater thirst for understanding and exploring the globe led to greater European exploration at this time.
Joseph Stalin's goal was to extend the empire of the Soviet Union. He also hoped to guarantee security, to spread communism beyond the Union, secure a position in the world affair and create an empire. Meanwhile, the Nazi-Soviet Pact was an agreement between the Soviet Union and Germany, whose objective was to pledge a non-belligerent force towards each other. This advanced the goal of Joseph Stalin because the Nazi-Soviet Pact does not interfere with the affairs of the different parties.
Answer:
Because it would be easier to fetch water and also because lands near the rivers are fertile to grow crops
