by Alexander Kent, USA Today
Declared an official holiday in 1971, Memorial Day honors those who have given their lives in service to the United States. While the human toll is always great, wars also cost treasure as well as blood.
Many factors can affect the cost of waging war. Using a report from the Congressional Research Service, 24/7 Wall St. reviewed the most expensive wars in U.S. history. While the Mexican-American War cost just $2.4 billion, or 1.4% of GDP in 1847, spending on World War II accounted for nearly 36% of GDP in 1945, or $4.1 trillion. These are the most expensive wars in U.S. history. Read the entire story.