A. Continual warfare among the many German states I think.
All of the countries were having a battle of who could build the biggest bombs, guns, tanks, weapons, technology, etc. which created tension between rival countries. everyone was afraid of the next country being too powerful. Hope it makes sense :-)
Extinction Of Animals, And Habitat Loss.
The Gadsden Purchase was the purchase of land in what is today Arizona and New Mexico from Mexico.
It was essential for the completion of the transcontinental railroad.
