[Solved] 300 Short Essay Answering

Write a 200-300 short essay answering these questions. How did peoples of the Americas come together in cities and communities that expanded trade and spread a diversity of products in North, Central, and South America? Pay attention to the differences and adjustments to terrain and the environment that people made which enabled them to farm and create food in rather hostile environments. Were the likely factors that created cities and empires to fail or weaken then any different than the factors today?