Answer:
is this a joke ?
I could help you history if you need it
I'd say to protect the USSR's western border from another invasion.
1791 French constitution limited the powers of the French Monarch
This question is generally related to the Olmec, Aztec, Incas and Indian tribes in North America.
For such civilizations the greatest geographic challenge was their isolation from the rest of Europe and Asia where modern science was completely changing the world.
Also, these civilizations had abundant farmland, game and food supplies yet North America rarely saw the development of large cities which limited their progress in human development.