How did italy's geography encourage the spread of the renaissance

Why is it useful for historians to base certain studies on the analysis of historical periods

What initiatives were taken by americans to benefit the war effort? 1. americans planted home gardens to ration food for the troops. 2.american charities were established to provide aid to factory workers. 3.american companies joined together to make products more cheaply. 4.americans created clubs for promoting weapons to be used in the war.

How did german physicist werner heisenberg's uncertainty principle shake beliefs in newtonian physics?