I am digging into ancient history books for our kids right now and I am doing my best to avoid books that put too much focus on anything that is violent or disturbing. Here are some titles I have purchased recently:
Prehistory:
The Best Book of Early People by Margaret Hynes
Cave People by Belinda Hayward
Ancients:
Let's See Ancient Rome by Lucia Raatma
Curious Kids Guides Ancient Egypt (Kingfisher)
Curious Kids Guides Ancient Greece (Kingfisher)
The Best Book of Ancient Rome (the paperback - the cover of the hardback has a picture I don't like)
The Best Book of Ancient Greece
I Wonder Why Greeks Built Temples by Fiona MacDonald (the Roman one from this series I did not care for)
Mummies, Pyramids, and Pharaohs: A Book About Ancient Egypt by Gail Gibbons
Geography:
As the Crow Flies: A First Book of Maps by Gail Hartman
Me on the Map (Dragonfly Books) by Joan Sweeney
Miranda the Explorer: A Magical Round-the-World Adventure by James Mayhew
Ready to Read: has a whole bunch of books on North American landmarks and features; Mount Rushmore, Grand Canyon, Statue of Liberty, Niagara Falls, Yellowstone, Rocky Mountains, Mississippi River, etc. These are easy to search and get the whole list on Amazon.
Biography (not really looked much yet):
More Than Anything Else by Marie Bradby
Booker T. Washington (On My Own Biography) by Thomas Amper
If you do a search on Amazon for "ready to read biography", a whole list from the series comes up, and then if you go into any book, down at the bottom, tons of other titles in that and other series also come up.
General "social rules" books I like:
The Golden Rule by Ilene Cooper and Gabi Swiatkowska
Have You Filled a Bucket Today? by Carol McCloud and David Messing