The 9 Periods at a Glance
AP US History divides the full course -- 1491 to the present -- into 9 official time periods, each with its own share of exam weight. Periods 3 through 8 carry noticeably more weight than Periods 1, 2, and 9, which matters directly for how you prioritize review time.
| Period | Years | Roughly known as | Exam weight |
|---|---|---|---|
| 1 | 1491–1607 | Contact and early colonization | 4–6% |
| 2 | 1607–1754 | Colonial North America | 6–8% |
| 3 | 1754–1800 | Revolution and the new nation | 10–17% |
| 4 | 1800–1848 | The early republic and expansion | 10–17% |
| 5 | 1844–1877 | Manifest Destiny, Civil War & Reconstruction | 10–17% |
| 6 | 1865–1898 | The Gilded Age and industrialization | 10–17% |
| 7 | 1890–1945 | The Progressive Era through World War II | 10–17% |
| 8 | 1945–1980 | The Cold War era | 10–17% |
| 9 | 1980–Present | The contemporary era | 4–6% |
- The date ranges genuinely overlap (Period 4 ends in 1848, Period 5 starts in 1844; Period 6 ends in 1898, Period 7 starts in 1890). That's not an error -- real historical transitions aren't clean cutoffs, and the course is built that way on purpose.
- Six of the nine periods (3 through 8) are weighted 2–4x higher than the other three. If you're triaging study time under pressure, that's real, official signal about where the exam draws from most.
- Periods 1, 2, and 9 are real, testable content -- just proportionally lighter. Don't skip them entirely; a 4–6% period can still show up on the MCQ or as one of your three required SAQs.
Why Period Weighting Still Matters Under the 2027 Exam Changes
If you've read APUSH DBQ & LEQ Predictions (2027), you already know the DBQ changed for 2027 -- it now draws evidence from across the whole course instead of clustering around one period. You might reasonably wonder if period-by-period weighting still matters.
It does, for two concrete reasons:
- The MCQ section is still built from this same period weighting. Nothing about the 2027 changes touched the multiple-choice section's period distribution.
- Each of your three required SAQs covers a different historical period. See the SAQ rubric -- you can no longer choose your way around a period you're weaker on.
So the practical use of this table hasn't gone away -- it's shifted from "which single period will the DBQ pick" (no longer a meaningful question) to "which periods should I make sure I'm not weak in, since I can't dodge any of them anymore."
How to Actually Use This Table to Study
- Weight your review time roughly in proportion to the table, not equally across all 9 periods. Periods 3–8 collectively make up the large majority of the exam.
- Don't zero out Periods 1, 2, or 9. They're lighter, not absent -- and since the DBQ can now pull evidence from anywhere in the course, being able to reference something accurate from every period has real value it didn't have before.
- Use the period ranges to sanity-check practice SAQs and DBQ evidence. If a source references, say, 1870, you should be able to place that inside Period 6 (1865–1898) without hesitating -- that placement is often the fastest way into contextualization points.
How This Connects to Your Composite Score
Period weighting affects how your MCQ and SAQ points get earned, but it doesn't change the underlying math of your composite. MCQ is still 40% of your score, SAQ is 20%, DBQ is 25%, and LEQ is 15% -- see the full formula on APUSH Scoring Explained. Once you have real section scores, plug them into the APUSH Score Calculator to see your estimated composite and AP score.
A Note on This Page
Date ranges and weighting figures reflect the official AP US History Course and Exam Description as reported through public College Board materials. Always confirm current-year figures directly on AP Central, since College Board can update these between course revisions.
This page is a companion to the APUSH Exam Guide -- see that page first for the complete exam format, then come back here for the period-by-period detail.
About the Author
This page and the APUSH score calculator are created and maintained by Rohit Chauhan, focused on turning complex AP scoring rules into clear, practical strategies for students.
Last updated: September 2026 • Have suggestions or corrections? Visit our Contact Us page.