They were developed during the civil war as protection from nuclear bombs and aftermath. Families could store all necessary food, water, clothes etc in these shelters and stay underground( where they were commonly built) protected.
habita
sandy ones :P
Built bomb shelters
Yes, African Americans did create paper. (Go African Americans!)
Snakes that live in water, use spit used from their venom to create little shelters. At one point they create a homing turret out of spit and mud that fire venom at ranges of 50 Feet.
The British Government decided to issue the Anderson shelter free to poorer households, and to provide steel props to create shelters in suitable basements.
Earth shelters (such as caves) or homes built from logs and natural materials.
farning encouraged native cultures to build more permanent shelters
Native Americans, such as the Inuit people, built igloos by cutting blocks of packed snow and stacking them in a spiral or dome shape. The snow blocks were then smoothed and compacted from both the inside and outside to create a sturdy structure. Igloos were mainly used as temporary winter shelters for hunting trips or when traveling.
The Civil Defense
You can find pictures of Yuki tribe shelters at the library. There are many books about Native Americans. You would also be able to find pictures of Native American shelters at Native American museums.
Indeed they did.