Answer:
The significance of the map was that it showed how New York City was before it became such a busy place. If he could see the geographical features from long ago
Explanation:
White people killed them and took over their land
Answer:
Explanation: The only real solution is to have a large automated labor force moving materials from Venus to Mars to make Mars large enough to kick start it's own magnetosphere and natural life cycle processes. The solar winds could potentially be harnessed to travel back and forth while stripping materials from Venus to Mars.
It would be harder for us to identify all the different types of animals that lived long ago.