What Were the Most Deadly Wars in American History?

When we think of American history, we often think of the brave soldiers who fought for their country’s freedom. However, with every war comes its fair share of deadly consequences. In this article, we will be taking a closer look at some of the most deadly wars in American history.

Civil War (1861-1865)

The Civil War is one of the deadliest wars in American history, claiming the lives of over 620,000 soldiers. This war was fought between the Union and Confederate States over issues such as slavery and states’ rights.

World War II (1941-1945)

World War II was a global conflict that involved many countries, but it had a particularly devastating impact on America. The war claimed the lives of over 400,000 Americans and is remembered for events such as D-Day and the atomic bombings of Hiroshima and Nagasaki.

World War I (1914-1918)

World War I was another global conflict that had a significant impact on America. Although it lasted only four years, it claimed the lives of around 116,000 Americans.

Vietnam War (1955-1975)

The Vietnam War was a long and controversial conflict that claimed the lives of around 58,000 Americans. This war involved guerilla tactics and was remembered for events such as the Tet Offensive.

Korean War (1950-1953)

The Korean War was fought between North Korea (supported by China) and South Korea (supported by the United States). It claimed the lives of around 36,500 Americans.


Every war has its own unique impact on American history. Whether it’s World War II or Vietnam War, each conflict has left an indelible mark on America’s past. By studying these wars, we can learn from our history and strive towards a better future.

  • Civil War: over 620,000 soldiers
  • World War II: over 400,000 Americans
  • World War I: around 116,000 Americans
  • Vietnam War: around 58,000 Americans
  • Korean War: around 36,500 Americans


  • National Park Service – Civil War Casualties
  • National WWII Museum – WWII Casualties
  • The American Legion – WWI Casualty Figures
  • The Vietnam Veterans Memorial Fund – The Wall Statistics
  • The Korean War Project – Casualties by Year/State/Nation/War/Cemetery
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