Just passing along some search results I found though I haven't read or looked at any of these to really say whether they are age appropriate or not.

https://www.amazon.com/dp/1619308347/

https://www.amazon.com/DK-Eyewitness-Books-Discover-Beliefs/dp/0756673208

https://www.amazon.com/DK-findout-Maya-Incas-Aztecs/dp/1465469311

https://www.amazon.com/Lets-Learn-About-Mexico-learning/dp/B087619S8W

https://www.amazon.com/Mexico-Childrens-South-America-Book-ebook/dp/B07TJQ4HT5