Conserve supplies so that farms could support soldiers
B. Strengthened power of feudalistic lords
The native Americans used to live in camps and their environment were dry and humid in the summer seen in the picture
The Golden Age. Generally speaking, historians and technicians refer to the time between post WWI and the Great Depression as the "Golden Age" of piano building, because by and large, many people had come to the conclusion that the design and general conception of the instrument was 'complete', and that there was very little room for further improvements.
Hope this is right:)