What is the four-year history cycle?

In classical homeschooling, history runs in four parts: the ancient world, the Middle Ages, the early modern period and the modern age. A child goes through it once in the grammar stage (about grades 1 to 4), again in the logic stage (5 to 8) and again in the rhetoric stage (9 to 12), each time in more depth. The Story of the World has one volume for each part.

What is expanding horizons in social studies?

It is the order US elementary textbooks have long followed: children study themselves and their family, then their school and neighborhood, then their community, state, nation and the world. Paul Hanna developed it in the 1930s and textbooks spread it from the 1950s.

What is a Book of Centuries?

A Charlotte Mason timeline in a notebook. Each two-page spread is one century, and the child adds people, events and small drawings as they meet them in their reading. Children usually keep their own from about age ten, and younger children share a family one.

At what age should you start Story of the World?

It is written to be read aloud to children in roughly grades 1 to 4, then revisited in the later stages. Volume 4, on the modern age, has more mature content, and many families wait on it or preview it first.

Chronological history

Also called history in order, the four-year history cycle, world history from the beginning, knowledge-rich history.

Ages Ages 5 to 18; most families start the cycle around 1st gradeGrades K–12Planning A plan you adaptScreens Some screen timeShelf Science, history and other subjectsUpdated November 2026

Chronological history teaches the past in the order it happened: ancient times first, then the Middle Ages, the early modern world and the modern age. Children hear it as a story, usually read aloud, and pin each person and event to a timeline and a map. Classical homeschoolers run it as a four-year cycle repeated three times, Charlotte Mason families keep a Book of Centuries, and Core Knowledge schools build it into a K-8 sequence. It is the main alternative to the expanding horizons model long used in US elementary schools, and it suits families who love stories and want history to hang together.

1 Where it came from

Two traditions sit side by side. In US public schools, Paul Hanna developed the expanding horizons (or expanding communities) model in the 1930s, and Scott Foresman textbooks spread it from the 1950s for about forty years: self and family first, then school, neighborhood, community, state, nation and world. Chronological history comes from a different line. The Well-Trained Mind by Susan Wise Bauer and Jessie Wise lays out a four-year history cycle that runs once in the grammar stage, again in the logic stage and again in the rhetoric stage, and Bauer's four-volume Story of the World is written for it. E. D. Hirsch's Core Knowledge Sequence, published by a foundation he started in 1986, also builds world and American history chronologically from prehistory to modern times.

2 The big ideas

History is one story. Events make more sense when a child knows what came before them.
Knowledge builds on knowledge. A specific, cumulative sequence means each year adds to the last instead of starting over.
Story first. Young children meet history through well-told narrative, read aloud, rather than through a textbook summary.
Tell it back. Narration, saying in your own words what you just heard, fixes it in memory.
Pin it down. A timeline and a map give every person and event a place in time and space.

3 What a lesson looks like

A 2nd grader and a parent sit on the couch with Story of the World, Volume 1, Ancient Times. The parent reads one short chapter aloud, about ancient Egypt. When it ends, the parent asks, "Tell me what happened," and the child narrates it back in a few sentences while the parent writes them down. Then comes map work: the child finds Egypt and colors the river blue on an outline map from the activity book. If there is time, there is a coloring page or a small project, such as building a pyramid from sugar cubes, and a picture book from the library's reading list for bedtime. Before putting the book away, the child glues a small picture onto the family timeline on the hallway wall. In a Charlotte Mason home the same day might use a different spine book and living books about one person, and the event goes into a Book of Centuries, a notebook where each two-page spread is one century. Children keep their own from about age ten; younger ones share a family book.

4 The adult's job

The adult reads aloud, listens to narrations, and keeps the timeline and map going. In a four-year cycle the parent chooses how deep to go each year and which extra books to add. Because Story of the World Volume 4 covers the modern age and carries more mature content, many parents preview it and some wait on it. In a Core Knowledge school the sequence names what each grade covers, and the teacher plans lessons within it.

5 How progress is checked

In homeschool versions, mostly through narration and the child's notebook: can they tell the story back, find the place on a map and put the event in the right century? Story of the World activity books include review questions for each chapter. Core Knowledge schools use their own tests; the Sequence itself sets content, not a test.

6 Strengths and criticisms

Strengths

History hangs together: a child who has met ancient Egypt and Rome has somewhere to put the next thing they learn.
It builds background knowledge, which reading comprehension depends on.
It is read-aloud friendly, so siblings of different ages can share one history lesson.
The Core Knowledge Sequence is free for noncommercial use.

Criticisms and watch-outs

Young children may find a long-ago story abstract, and the modern age arrives late in each cycle.
Any single narrative history carries its author's choices about what to include; read reviews and preview chapters, especially for older volumes.
Expanding horizons has shaped US elementary social studies for decades, so a child moving between home and school may meet a different order.
The evidence for teaching history in this order, as opposed to building knowledge in any coherent order, is thin.

7 What the research says

There is no direct test of chronological order itself. The closest evidence is about knowledge-rich schooling in general. A lottery study of 14 oversubscribed kindergarten lotteries at nine Colorado Core Knowledge charter schools found significant reading gains in grades 3 to 6, about 16 percentile points by Education Next's account. Science effects were not significant, and the applicants came mostly from middle- and higher-income districts, so it is one study in one setting. Expanding horizons was designed to prepare citizens for a democracy, starting from what a young child already knows. This guide found no body of studies comparing the two orders head to head.

8 How to try it

Put a long strip of paper along a hallway wall and mark it in centuries. Add one picture every time history comes up, from any book.
Choose one narrative spine (a world history read-aloud) and read one short chapter two or three times a week.
After each reading, ask the child to tell it back. Write down what they say, and keep the pages in a folder.
Find every place on a map or globe as it comes up, and color it in on a printed outline map.
Add a picture book or a story about one person from the period at bedtime, from the library or Peabody's shelves.

9 Using Peabody with it

History storiesShort stories set in the past, sorted by reading level, that can sit beside a spine book; they are not arranged as a chronological course.
Reading passages by gradeLeveled nonfiction passages include history topics such as Roman roads, the Silk Road and Gutenberg's printing press, with questions, for narration or a quick read.
Planet: the 3D globeA globe a child can spin to find countries, rivers and mountains for map work.
The Story of the World, reviewedOur page on the best-known chronological history program for homeschoolers.
Core Knowledge, reviewedOur page on the free K-8 sequence that builds history in order.

Peabody is free and has no ads. Pages on peabody.kids are for children; pages here are for the adults teaching them.

10 Programs that follow it

Programs and materials often named with this approach: The Story of the World (Susan Wise Bauer), Core Knowledge Sequence.

Questions people ask

What is the four-year history cycle?: In classical homeschooling, history runs in four parts: the ancient world, the Middle Ages, the early modern period and the modern age. A child goes through it once in the grammar stage (about grades 1 to 4), again in the logic stage (5 to 8) and again in the rhetoric stage (9 to 12), each time in more depth. The Story of the World has one volume for each part.
What is expanding horizons in social studies?: It is the order US elementary textbooks have long followed: children study themselves and their family, then their school and neighborhood, then their community, state, nation and the world. Paul Hanna developed it in the 1930s and textbooks spread it from the 1950s.
What is a Book of Centuries?: A Charlotte Mason timeline in a notebook. Each two-page spread is one century, and the child adds people, events and small drawings as they meet them in their reading. Children usually keep their own from about age ten, and younger children share a family one.
At what age should you start Story of the World?: It is written to be read aloud to children in roughly grades 1 to 4, then revisited in the later stages. Volume 4, on the modern age, has more mature content, and many families wait on it or preview it first.

Sources

Core Knowledge Sequence, Core Knowledge Foundation.
The Story of the World: History for the Classical Child, Volumes 1-4, Cathy Duffy Reviews.
Book of Centuries, Simply Charlotte Mason.
Paul Robert Hanna: A Life of Expanding Communities, Hoover Institution.
EdWorkingPaper ai23-755 (Grissmer et al.), Annenberg Institute at Brown University (2023).

Classical education: Facts and memory work when young, logic in the middle years, argument and writing in the teens, with history taught in order.
Charlotte Mason: Short lessons, real books instead of textbooks, telling back instead of worksheets, and time outdoors watching nature.
Core Knowledge: A free, grade-by-grade list of the history, science, literature and art every child should meet, so knowledge builds year on year.
Knowledge-building English: Reading and writing organized around weeks-long topics in science, history and the arts, so children build the knowledge and words comprehension depends on.
Inquiry-based social studies: Social studies built around a big question: students work through documents, maps and data, then make and defend an argument.
Unit studies: One theme, such as oceans or the Middle Ages, carries reading, writing, science, history and art for days or weeks.
Every approach in the curriculum guide

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