4

Famous Americans: Thomas Jefferson

4

Gateway Arch

4

The American Revolution

4

Maddy's Virginia Diary

3

Galaxies

4

Maddy's Montana Diary

3

Comets

4

The White House

4

History of the United States

4

America in the 20th Century

3

Sacagawea

3

Inventors and Inventions

4

Maddy's West Virginia Diary

4

Canterbury Cathedral, Canterbury, England

4

Maddy's New Jersey Diary

4

Washington Monument

4

An Introduction to the History of the United States of America

4

Chip's Tips on United States

4

Maddy's South Dakota Diary

4

From the American Revolution to the Civil War

4

Mount Rushmore