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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.

Many early wars in U.S. history resulted in the acquisition of land. The Mexican-American War in the 1840s yielded much of the territory that makes up the present-day Southwest.

Similarly, the Spanish-American War prior to the start of the 20th Century ended with U.S. control of Guam, Puerto Rico, and the Philippines.

In every conflict before World War II, nearly all of the country’s defense budget was spent on direct conflict — classified as wartime spending. For example, the U.S. spent 1.1% of GDP in 1899 to fight the Spanish-American War, and just 1.5% of GDP was spent on total defense spending.

That trend largely changed at the start of the Cold War. The persistent threat of military conflict ensured that the U.S. would be ready for war at any time, as the Space Race and nuclear armament became national priorities in both the U.S. and the Soviet Union.

As a result, wartime spending and defense spending began to diverge. During the Korean War, for example, war costs accounted for just 4.2% of GDP in 1952, while total defense spending represented more than 13% of GDP in the same year.

Comparing war costs over a 235-year period can be difficult. While the report attempted to correct for inflation by calculating each war’s cost in fiscal year 2011 dollars, inflation adjustments do not account for advances in technology. It is entirely possible that wars also became more expensive over time as the sophistication and cost of technology increased.

To determine the most expensive wars in U.S. history, we used a 2010 report from the Congressional Research Service entitled “Costs of Major U.S. Wars”. The report does not include veterans’ benefits, interest on loans used to finance the war, and assistance to allies.

Additionally, the report attempts to capture the increase in military expenditures during wartime and does not include the costs of maintaining a standing army in peacetime.

The report also presents both military costs and defense spending as percentages of GDP in the year of peak war spending. War cost figures for the War on Terror were updated to reflect expenditure after 2010.

These are the most expensive wars in U.S. history.

10. Mexican-American War

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Fought between 1846 and the start of 1848, the Mexican War cost the United States $2.4 billion, the 10th-most expensive war in U.S. history.

Texas, having gained its own independence from Mexico a decade earlier, had still not been granted statehood by the U.S. Texas’ annexation would have upset the equilibrium between slave and free states established by the Missouri Compromise of 1820.

Mexico hoped to capitalize on U.S. indecision when its army crossed the Rio Grande to attack U.S. forces in the battle of Palo Alto. The war ended on February 2, 1848, with the Treaty of Guadalupe-Hidalgo, which established the Rio Grande as the southern border of Texas and settled U.S. acquisition of land in present-day California, Utah, Nevada, Arizona, and New Mexico for $15 million.

9. American Revolution

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The nearly nine-year quest for independence cost the American colonies just over $2.4 billion, and nearly 4,500 lives in battle.

While the war began as a revolt against unjust taxation, it ended with the Founding Fathers rejecting the social and political structures of Europe in favor of a democratic republic.

The Treaty of Paris ended the war in 1783, officially recognizing the U.S. as an independent country and establishing its borders.

8. Spanish-American War

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Often dubbed the first “media war,” sensationalized journalism helped fuel America’s support for involvement in the Cuban quest for independence from Spain.

When the U.S.S. Maine, which had been sent to Havana to protect American interests, unexpectedly blew up in 1898, cries for American intervention increased.

Congress officially declared war under the Monroe Doctrine — a foreign policy agenda that proclaimed a U.S. right to intervene in regional conflicts in the Western Hemisphere — and crushed Spanish forces worldwide in less than nine months.

The war cost $9 billion and the U.S. acquired Guam, Puerto Rico, and the Philippines.

7. American Civil War

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The Civil War claimed more American lives — 750,000 — than all other U.S. conflicts combined, and cost both sides nearly $80 billion.

Fought primarily over the issues of slavery and states’ rights, such as taxation and representation, the Civil War began after South Carolina seceded from the Union and fired upon a Union merchant ship heading to Fort Sumter with supplies.

The standoff in Charleston Harbor continued until April 1861, when the war officially began. Four years later, General Robert E. Lee of the Confederate States of America surrendered to Ulysses S. Grant at Appomattox Court House, Virginia.

6. Gulf War

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The Persian Gulf War was one of the shortest conflicts in U.S. history, costing $102 billion, or just 0.3% of GDP in 1991. Tensions mounted when Iraqi dictator Saddam Hussein invaded Kuwait. Despite strong calls from the United Nations for Iraq to withdraw, Hussein refused.

See also: 18 Most Terrifying Special Forces From Around The World

A few months later, a U.S.-led coalition initiated Operation Desert Storm. The offensive lasted 42 days. As the first major conflict after the Cold War, the Persian Gulf War was, at the time, heralded as a success for the international coalition.

5. World War I

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War broke out in Europe in 1914 but the U.S. remained neutral for the next three years.

However, after Germany reneged on its pledge to respect the neutrality of U.S. ships in the Atlantic, and tried to entice Mexico into declaring war on the U.S., President Woodrow Wilson asked Congress for a declaration of war on April 2, 1917.

The war ended 19 months later with the Treaty of Versailles. Ultimately, the war cost the U.S. $334 billion, or nearly 14% of GDP in 1919.

4. Korean War

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In June 1950, the Soviet-supported North Korean military crossed the 38th parallel that divided North and South Korea. Fearful of the spread of communism, President Harry Truman garnered support from allies in the United Nations Security Council to drive the North Korean troops out of the South.

General Douglas MacArthur, however, pursued the North Koreans to the Yalu River, which formed the northern border between China and the Korean peninsula. The Chinese interpreted MacArthur’s actions as an act of war and routed the U.N. troops, forcing them to retreat below the 38th parallel.

The war eventually ended after Dwight Eisenhower assumed the presidency and threatened the use of nuclear weapons if the North Koreans or Chinese did not respect the 38th parallel as the boundary between the two countries. Ultimately, the Korean War cost the U.S. $341 billion and nearly 34,000 lives.

3. Vietnam War

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The war in Vietnam cost the U.S. $738 billion, or just 2.3% of GDP in 1968. By the end of the conflict, the names of more than 58,000 dead soldiers were recorded on the Vietnam Veterans Memorial in Washington, D.C. After North Vietnamese troops drove the French out of the region in 1954, ending a brutal era of colonialism, the Geneva Accords stipulated that elections in the South be scheduled for the following year.

Determined not to let communism spread, the U.S. lent its support to Ngo Dinh Diem, a French-educated, Catholic politician in South Vietnam. By the time the U.S. committed troops in 1965, Diem had been assassinated and Vietnamese support for the new military-led South Vietnamese government had faded.

See also: The Real Reason America Dropped The Atomic Bomb. It Was Not To End The War

With supplies from China and the Soviet Union, North Vietnam primarily used guerilla tactics to attack U.S. troops and bases, often by surprise. By the late 1960s, public support for the war in the U.S. was fading. American troops officially withdrew from the region in 1973 and South Vietnam fell to communism in 1975.

2. War on Terror

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Conflicts in Iraq and Afghanistan following September 11, 2001 — collectively known as the War on Terror — cost the U.S. more than $1.6 trillion through 2010.

The U.S. entered Afghanistan in October 2001, to search for Osama bin Laden, the mastermind behind the terrorist attacks in New York and Washington D.C., and to overthrow the Taliban government, which was long suspected of harboring terrorists. U.S. troops invaded Iraq and overthrew Saddam Hussein in 2003 operating on the belief that he had weapons of mass destruction.

Elections in both Iraq and Afghanistan, as well as training military personnel in each country to help stabilize the region, are both heralded as successes. Despite these successes, both countries continue to be marred by conflict.

1. World War II

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Once the U.S. emerged from its isolationist shell, it spent more than $4 trillion fighting in World War II and lost more than 400,000 troops. U.S. involvement officially began on December 8, 1941, the day after the Japanese bombed Pearl Harbor.

America officially declared war against Germany and Italy three days later. After conquering a number of European countries, Germany focused its attention on the Soviet Union. By 1944, Soviet forces were successfully driving German troops west. On June 6, 1944, Allied forces landed on the beaches of Normandy, pushing east into Europe, and splitting the Germans along two fronts.

In the Pacific, U.S. military experts estimated that an invasion of Japan would likely result in much greater casualties. President Harry Truman ordered an atomic bomb be dropped on Hiroshima on August 6, 1945. Months earlier, at the Yalta Conference in 1945, Stalin had promised to enter the Pacific front within three months of the war’s end in Europe.

If the Soviets were involved in Japan’s defeat, they would likely insist on reparations. To prevent a Soviet claim to Japanese assets, assert U.S.-dominance over Stalin, and secure a Japanese surrender, Truman ordered a second atomic bomb dropped on Nagasaki on August 9, the day after the Soviet Union declared war on Japan.

By the end of the war, more than 50 million soldiers and civilians had given their lives, according to conservative estimates.

SOURCE247wallst
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