<span>Immigrants will work for low wages and break strikes, thereby hurting all American workers.</span>
It dried up.
North Africa used to be a fertile grassland, even swampy in some spots, 12,000 years ago. By 1000 BC (actually quite a while before) it had dried up into what is the the largest desert i the world: the Sahara.
The washington presidency was a precedent cabinet.<span />
In general, "<span>d. an area free from warfare</span>" is not essential in building a new civilization, since in order to build a civilization in the first place you need a surplus of food and warfare is almost inevitable.