4

Famous Americans: Thomas Jefferson

4

From the American Revolution to the Civil War

3

Inventors and Inventions

4

Maddy's South Dakota Diary

4

Maddy's West Virginia Diary

4

Mount Rushmore

4

Maddy's New Jersey Diary

4

Gateway Arch

3

Comets

4

Chip's Tips on United States

4

Maddy's Montana Diary

4

The American Revolution

3

Galaxies

4

An Introduction to the History of the United States of America

4

Washington Monument

4

History of the United States

4

The White House

3

Sacagawea

4

Canterbury Cathedral, Canterbury, England

4

America in the 20th Century

4

Maddy's Virginia Diary