The primary way in which the Hundred Years’ War changed warfare in Europe is that it was the first "total" war, in the sense that all resources were mobilized to fight.
One main reason why John C Breckenridge supported the purchase of the Louisiana territory was because he thought it would held end the issue of slavery, by leaving it up to "popular sovereignty" in the new territory.
The Roaring Twenties
The Roaring Twenties was a time when young women fought against the traditional gender norms. These women (commonly referred to as flappers) would wear short dresses, smoke in public, drink alcohol, and dance in jazz clubs. These acts were all frowned upon for women to do at the time. While in the twenties these women were often viewed as immoral and dangerous, we have since come to recognize them as pioneers of women’s independence, as they pushed back against gender norms.
They became sedentary. they started to use agriculture to create a surplus of food and as the need for farmers decreased; different duties emerged and that led to the formation if civilizations.