diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index 4c6b0db..a6c6d08 100644
--- a/src/SUMMARY.md
+++ b/src/SUMMARY.md
@@ -13,4 +13,8 @@
     - [Spoons](u1/8.md)
 - [Unit 2: Revolution!](u2/README.md)
 - [Unit 3: The Federalist Period](u3/README.md)
-
+- [Unit 4: The Fragile Experiment](u4/README.md)
+  - [Jeffersonian America](u4/1.md)
+  - [The *Really* Fragile Nation](u4/2.md)
+  - [The War of 1812](u4/3.md)
+  - [A Brief Primer on the Industrial Revolution](u4/5.md)
diff --git a/src/u4/1.md b/src/u4/1.md
new file mode 100644
index 0000000..edd5114
--- /dev/null
+++ b/src/u4/1.md
@@ -0,0 +1 @@
+# Jeffersonian America
diff --git a/src/u4/2.md b/src/u4/2.md
new file mode 100644
index 0000000..f67fb2d
--- /dev/null
+++ b/src/u4/2.md
@@ -0,0 +1 @@
+# The Really Fragile Nation
diff --git a/src/u4/3.md b/src/u4/3.md
new file mode 100644
index 0000000..8555707
--- /dev/null
+++ b/src/u4/3.md
@@ -0,0 +1 @@
+# The War of 1812
diff --git a/src/u4/5.md b/src/u4/5.md
new file mode 100644
index 0000000..4bb339f
--- /dev/null
+++ b/src/u4/5.md
@@ -0,0 +1 @@
+# A Brief Primer on the Industrial Revolution
diff --git a/src/u4/README.md b/src/u4/README.md
new file mode 100644
index 0000000..516740c
--- /dev/null
+++ b/src/u4/README.md
@@ -0,0 +1 @@
+# Unit 4: The Fragile Experiment