where can i find information on Asia's history for preschoolers to understand it?

Answer 1

There are some very good childrens' encyclopeadias of the world and world hisory available on line at amazon.co.uk but there seems to be nothing specific to Asia.
The Usbourne Internet Linked Encyclopeadia of the world looks like it might have some threads to follow but may be a bit old so would need to be adapted to the age of your child!
Amazon.com (america) has a few more possibilities: Great civilizations of the east aimed at 4-8yrs and Asia (true books, continent) paperback alos aimed at the same age range might offer some possibilities. I hope this helps.

Answer 2

Library or go the pbs.com online