The.

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)

src/u4/1.md

@@ -0,0 +1 @@
+# Jeffersonian America

src/u4/2.md

@@ -0,0 +1 @@
+# The Really Fragile Nation

src/u4/3.md

@@ -0,0 +1 @@
+# The War of 1812

src/u4/5.md

@@ -0,0 +1 @@
+# A Brief Primer on the Industrial Revolution

src/u4/README.md

@@ -0,0 +1 @@
+# Unit 4: The Fragile Experiment