the answer is: bring it home safely
The project was initiated during the period of space race, when united states compete with the soviet union to explore the space and hopefully bring home new resources that can benefit the nations.
The biggest challenge faced by the mercury program is that the pressure that a vehicles might face as pass through the atmosphere into the earth could make the vehicles explode and kill all the passengers in it.
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 idea and concept of Popular Sovereignty is the belief that the authority, legality and legitimacy of the government is created by the will or consent of its people.