People adapt to different clothing through their environment while other clothing preferences have diffused from their places of origin. Poncho is from South America while dashiki and parka are example of African clothing.
These clothings were diffuse slowly to other locations through the process of relocation diffusion. People living in folk culture still using their traditional clothing because environmental and traditional reasons. Environmental factors which include the weather, while traditional factors maybe because of the religion or tourism.
Some volunteer others got drafted if you were 18 and met physical conditions you were required to go to war it angered many Americans because they were against the war and because 18 year old boys were being taken to fight
india was surrounded by mountain ranges. enemies could not get over the mountains easily at all. so they didn't even try. the mountains were excellent physical barriers.