There's always more to say on the subject, but you may be interested in these previous answers:

• Is there an explanation as to why there were Empires such as the Inca's and Aztec's in the Southern Hemisphere, and yet no such Empires in the North? by /u/bem-ti-vi
• What differences caused the Mesoamerican societies to be much more successful than Eastern North American societies? by u/Reedstilt