有哪些難度ar 6以下的英文歷史書推薦？

The World Made New: Why the Age of Exploration Happened and How It Changed the World (National Geographic Timelines)

The Story of the Birmingham Civil Rights Movement in Photographs (Story of the Civil Rights Movement in Photographs)

Sailors, Merchants, and Muleteers of the California Mission Frontier (People of the California Missions)

George Washington, Spymaster: How the Americans Outspied the British and Won the Revolutionary War

Marie Antoinette "Madame Deficit" (The Thinking Girl's Treasury of Dastardly Dames)

The Election of 1860: A Nation Divides on the Eve of War (Presidential Politics)

The 1950s from the Korean War to Elvis (Decades of the 20th Century (Hardcover))

Passing of the Civil Rights Act of 1964 (Stories of the Civil Rights Movement)

New Nation Through the Eyes of George Washington (Presidential Perspectives)

Confederate Commander: General Robert E. Lee (We the People: Civil War Era)

The European Industrial Revolution (Cornerstones of Freedom: Third Series)

World War I Through the Eyes of Woodrow Wilson (Presidential Perspectives)

Mary Tudor "Bloody Mary" (The Thinking Girl's Treasury of Dastardly Dames)

Spanish Colonies in America (We the People: Exploration and Colonization)

O, Say Can You See? America's Symbols, Landmarks, And Important Words

Attila The Hun: Leader of the Barbarian Hordes (Wicked History)

Ancient Greek War and Weapons (People in the Past, Greece)

The Battle of Gettysburg (Turning Points in U.S. History)

California Ranchos (We the People: Expansion and Reform)

The Articles of Confederation (Documenting U.S. History)

Women of the Confederacy (We the People: Civil War Era)

Reconstruction: Rebuilding America after the Civil War

The U.S. Constitution (Turning Points in U.S. History)

The Middle Ages (Primary Sources in World History)

A Nation Divided: The Long Road to the Civil War

Pilgrims in America (Events in American History)

The 1940s: From World War II to Jackie Robinson

A Primary Source History of the War of 1812

Ancient Egyptian Warfare (Ancient Warfare)

Ancient Persian Warfare (Ancient Warfare)

Ancient Roman Warfare (Ancient Warfare)

Ancient Greek Warfare (Ancient Warfare)

Catherine the Great (A Wicked History)

Guts & Glory: The American Revolution

What Was the Holocaust?

Benjamin Franklin