Wow, what a great idea! Intelligent, secular resources are frustratingly hard to find - but they are out there. It just takes a lot of digging!
The worst is getting excited about a possible resource only to find it has subtle indoctrination woven through it or finally locating secular material and discovering with great disappointment that it's so poorly written it isn't usable. Ugh.
Anyways, recently I went on a quest to find history materials, specially world history. I found several things that might be appropriate to include on the curricula tables:
World History For Us All This curriculum is being developed by San Diego State University in conjunction with UCLA. It's intended for middle & high school students but may work for families with younger-age children, too. It may be worth taking a look because my daughter, age 8, understands most of the material. This curriculum is in development, so the entire program isn't available yet but there is already a lot of finished material that it can be downloaded from the site. Not only is it entirely secular, it's free as well (although this may not be true in the future when program development is completed).
The program is divided into 9 big eras along with two other sections that bookend the program. Each era/section has multiple teaching units and these are offered in different scales - panorama, landscape, and close-up - depending on the amount of time you want to cover the material in and how in-depth you want to go with a particular topic. These "scaled units" can be mixed & matched - you can use a panorama unit to cover Era 1 and then switch to the Landscape units for Era 2. One of the unique things about this program is approach to world history by using three major themes that connect all the events and people throughout history.
NCHS Teaching Units : This is from the National Center for History in Schools, UCLA. The World History units are divided into 9 eras, with between 1 and 10 teaching units in each era. Each unit costs about $17 although they do put some on sale occasionally. The approach here is similar to World History For Us All (perhaps because UCLA is a partner on that project). Although the programs are not identical these two curricula can be used together, as they do complement each other. This site also offers U.S. History in the same manner - there are 10 themes (or eras) with multiple units available in each.
I noticed that it seems the NCHS units are pretty equivalent to the "close-up" units at World History For Us All. Since not many "close-up" units are ready on the World History For Us All site, the NCHS units could be used to fill in the gaps and create a more complete curricula for those who want to get started now rather than waiting for the program developers to get finished.
History Pockets : Evan Moor makes this series that combines history with simple craft projects. The materials are provided to make a folder (or pocket) that can contain all the work, but the materials can be used in other ways, too - for example, a scrapbook of Ancient History. It's also good stuff to add to shutterbooks (also known as lapbooks). This product works well with families that like to keep portfolios and for kids that like to color, cut, and glue stuff! They have two levels, grades 1-3 and grades 4-6, but either level can be used by kids of almost any age. Each pocket explores one subject such as Ancient Egypt, the Civil War, or Native Americans.
While Dinah Zike's
Big Books Of History don't offer a curriculum, they are neat (and secular!) supplements for studying history. The books show you how to make hands-on history manipulatives. The second half of the books list various history topics and gives suggestions on how to turn the information into foldables - everything from timelines to mini books to diorama displays and more.
The other resource I'd like to recommend is
World History : Patterns of Interaction by McDougal Littell. Yes, this is a textbook intended for school classrooms (which I generally avoid like the plague). However, this one is worth considering for many reasons. Not only is it secular, it's one of the most unbiased texts I've encountered. While no textbook is perfect, this one seems to cover most controversial subjects - including topics like religion, military service, war, historical figures - in an even manner and offers several different viewpoints on each. Whereas other textbooks tend to shy away from such discussions or treat them in a sugar-coated way, this one encourages the reader to explore various perspectives (even the less popular ideas).
Secondly, it approaches information from a world perspective, which means it contains less of the subtle indoctrination that so many history textbooks written for U.S. classrooms contain. In other words, the information is provided in a more balanced way rather than taking a position that supports a particular political or governmental point of view. There are independent, critical reviews of textbooks available online and while many textbooks have been faulted for containing poor writing, misleading or incorrect information, and a dumbed-down approach, this book faired well under examination.
The other reason I suggest this book is because it's widely available on places like eBay, Amazon, Alibris, and other places for about the same price as you'd pay for Story of the World materials. There are several publication years - from 2000 up - and all of the books contain roughly the same information, some editions have different visual layouts and others have revised a small percentage of the text for clarity.
I'm not recommending that anyone try to purchase the entire program as most of the materials are intended for classroom use (overhead transparencies, test practice, etc) and that would probably be a great waste of money. If you're trying to keep it simple and stay on budget, you really only need a copy of the student book. In fact, if you are eclectic homeschoolers or an unschooling family, you may wish to use this book simply as a jumping-off point for activities and exploration into world history. In our house it works like a reference book; for us it's more of a chronological encyclopedia than a teaching textbook (but is much more in-depth than the Kingfisher or Usborne encyclopedias, which we also have).
Oh, I need to add that although this textbook is intended for high-school, the text and wording seems suited to middle school (jmo). I think it would be easy to adapt for younger kids, too. Use it as a spine and go to town with foldables, shutterbooks, crafts, make mini books, check out biographies, picture books & historical fiction from the library, rent documentaries from Netflix or A+ Educational Videos... you know what works for your kids.
Wow, I got long-winded. Ok, I'm done!
PS -- I have absolutely no affiliation with any of these products, when I discovered these materials I was just a mom on a mission! It's important to me that I provide my kids with intelligent, well-written materials that are fun to use and allow them the courtesy of thinking for themselves.