Baseball game at the Hall of Fame's Doubleday Field on June 12, 1939 

President Abraham Lincoln, photographed by Mathew Brady

Reinforcements disembarking from a landing barge at Normandy during the Allied Invasion of France on D-Day.

Babe Ruth won three World Series titles with the Red Sox before he joined the Yankees in 1920.

Clint Dempsey and teammates celebrate Dempsey's goal in a group match tie between the United States and Portugal at the 2014 FIFA World Cup Brazil.

Deeper Roots of Northern Slavery Unearthed

Clouds hover above the surrounding geothermal waters at the Blue Lagoon close to the Icelandic capital on April 7, 2014 in Reykjavik, Iceland.

John Rockefellercirca 1930: American philanthropist, John Davison Rockefeller (1839 - 1937). (Photo by General Photographic Agency/Getty Images)

<p><a href="http://www.christopherklein.com/">Christopher Klein</a> is the author of four books, including <em>When the Irish Invaded Canada: The Incredible True Story of the Civil War Veterans Who Fought for Ireland’s Freedom</em> and <em>Strong Boy: The Life and Times of John L. Sullivan</em>. His work has appeared in numerous publications, including <em>The Boston Globe</em>,<em> The New York Times</em>, and <em>National Geographic Traveler. </em>Follow Chris at <a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.twitter.com_historyauthor&amp;d=DwMFaQ&amp;c=bHpC9irXhivtSwyVyKc43lLt4-cAwmmH7TeQLPqTb5E&amp;r=0ZpTu-He2V3GUI-VETMmkwm8-GyOWSyeMJXqt7G42KA&amp;m=K4QAG6bPcooItZtsSRYJId99sCdkkYnSQnbG55Y82ZU&amp;s=reHlmdZq8nMnpunXM6VDAaQCLeVwu9L3gbscryyWKD8&amp;e=">@historyauthor</a>.</p>


Christopher Klein

Christopher Klein is the author of four books, including When the Irish Invaded Canada: The Incredible True Story of the Civil War Veterans Who Fought for Ireland’s Freedom and Strong Boy: The Life and Times of John L. Sullivan. His work has appeared in numerous publications, including The Boston Globe, The New York Times, and National Geographic Traveler. Follow Chris at @historyauthor.

Christopher Klein Archives | HISTORY

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HISTORY

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<p>America’s Founding Fathers decided that one elected civilian—the U.S. president—would lead the executive branch of the federal government, a governmental structure that has remained in place for more than 200 years.</p>


U.S. Presidents

Listicle

Legacy Unpublished

<p>The 1960s was one of the most tumultuous and divisive decades in world history. The era was marked by the civil rights movement, the Vietnam War and antiwar protests, countercultural movements, political assassinations and the emerging "generation gap."</p>


1960s

<p>The Civil War was America's bloodiest and most divisive conflict, pitting the Union Army against the Confederate States of America. The war resulted in the deaths of more than 620,000 people, with millions more injured and the South left in ruins.</p>


Civil War

<p>Sports and recreation are an integral part of human history, from the ancient Olympics to the Kentucky Derby, Jackie Robinson, Negro League Baseball, the Super Bowl and more.</p>


Sports

<p>In the early 20th century, America was flexing its economic and political muscle on the international stage. The era was defined by the temperance movement, Progressive-era activism, the sinking of the Titanic and World War I.</p>


Early 20th Century U.S.

<p>World War II was the biggest and deadliest war in history, involving more than 30 countries. Sparked by the 1939 Nazi invasion of Poland, the war dragged on for six bloody years until the Allies defeated the Axis powers of Nazi Germany, Japan and Italy in 1945. Explore the battles, leaders and atrocities from the war and its impact on geopolitics and humankind.</p>


World War II

<p>Space exploration, one of the greatest technological achievements in human history, includes the Apollo missions, the Space Shuttles Columbia and Challenger, and people like Buzz Aldrin and Neil Armstrong.</p>


Space Exploration

<p>Inventions from the telephone to the Model T and the computer have defined human history, and inventors like Leonardo da Vinci, Nikola Tesla, Thomas Edison, Eli Whitney and Alexander Graham Bell have transformed our society.</p>


Inventions & Science

<p>Landmarks and monuments, the physical record of human civilization, include spectacular structures like the Eiffel Tower, Mount Rushmore, the Panama Canal, the Brooklyn Bridge and more.</p>


Landmarks

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<div class="p-rich_text_section">African Americans have played a central role in shaping U.S. history. From slavery and its abolition to the Great Migration, the civil rights movement and military, scientific, cultural and political achievements, explore key moments, milestones and figures in Black History.</div>
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Christopher Klein ‑ Stories

10 Things You May Not Know About Samuel Colt

What If the Moon Landing Had Failed?

10 Things You May Not Know About Babe Ruth

Abraham Lincoln’s Battlefield Brush with Death

10 Things You May Not Know About John D. Rockefeller

Ancient Sumerian Relics Found in English Cupboard

The Forgotten Golden Age of American Soccer

Deeper Roots of Northern Slavery Unearthed

The Civil War Comes to France, 150 Years Ago

10 Things You Should Know About Iceland

Baseball’s Cooperstown Myth

The Weather Forecast That Saved D‑Day