The men who united the States : America's explorers, inventors, eccentrics, and mavericks, and the creation of one nation, indivisible

Undaunted courage : Meriwether Lewis, Thomas Jefferson, and the opening of the American West

The most powerful idea in the world : a story of steam, industry, and invention

Here is where : discovering America's great forgotten history

The true flag : Theodore Roosevelt, Mark Twain, and the birth of American empire

1493 : uncovering the new world Columbus created

Railroaded : the transcontinentals and the making of modern America

Columbus : the four voyages

The idea of America : reflections on the birth of the United States

American republics : a continental history of the United States, 1783-1850

These truths : a history of the United States

The end of the myth : from the frontier to the border wall in the mind of America

The year 1000 : when explorers connected the world -- and globalization began

1493 Uncovering the New World Columbus Created