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Fought in Afghanistan and Pakistan
Contestants: Afghanistan V.S. US and Britan
U.S. Troops Serving: 8,400

U.S. Casualties: 2,403 dead

Financial Cost: $783 billion through the fiscal year 2016

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Fought in Iraq
The conflict between Iraq and a coalition of 39 nations including the United States, Britain, Egypt, France, and Saudi Arabia
Population: 260,000,000

'Service Members: 2,750,000

Ratio: 1.1%

Casualties: 382 Dead, 467 Wounded

Financial Cost in billions (1990s): $61.1

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Fought in Vietnam
North Vietnam was supported by the Soviet Union, China, and North Korea, while South Vietnam was supported by the United States, South Korea, Thailand, Australia, New Zealand, and the Philippines.
Population: 204,900,000

Service Members: 8,744,000

Ratio: 4.3%

Casualties: 58,168 Dead, 303,635 Wounded

Financial Cost in billions (1990s): $346.7

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Fought in Korea
North Korea, supplied and advised by the Soviet Union, invaded the South. The United Nations, with the United States as the principal participant, joined the war on the side of the South Koreans.
Population: 151,700,000

Service Members: 5,764,100

Ratio: 3.8%

Casualties: 33,651 Dead, 103,284 Wounded

Financial Cost in billions (1990s): $263.9

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Fought all over the globe
the Axis powers—Germany, Italy, and Japan.
And the Allies—France, Great Britain, the United States, the Soviet Union, and, to a lesser extent, China.
Population: 135,500,000

Service Members: 16,353,700

Ratio: 12.2%

Casualties: 407,316 Dead, 670,846 Wounded

Financial Cost in billions (1990s): $2,091.3

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Spanish-American War (1898) April 21- August 13)

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Spanish-American War (1898) April 21- August 13)

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The United States V.S. Spain
The United States and Spain were largely fought in Cuba and the Philippines.
Population: 74,600,000

Service Members: 306,800

Ratio: 0.4%

Casualties: 387 Dead, 1,662 Wounded

Financial Cost in billions (1990s): $6.3

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American Civil War (April 12, 1861 – April 9, 1865)

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American Civil War (April 12, 1861 – April 9, 1865)

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Fought in America
Between the United States of America and the Confederate States of America
Population: 34,300,000

Service Members: 3,867,500

Ratio: 11.1%

Casualties: 620,000 Dead, 412,175+ Wounded

Financial Cost in billions (1990s): $44.4

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Mexican-American War (April 25, 1846 – February 2, 1848)

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Mexican-American War (April 25, 1846 – February 2, 1848)

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Fought in Texas, New Mexico, California; Northern, Central, and Eastern Mexico; Mexico City
War of the United States Against Mexico
Population: 21,100,000

Service Members: 78,718

Ratio: 0.4%

Casualties: 13,283 Dead, 4,152 Wounded

Financial Cost in billions (1990s): $1.1

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Fought in the United States, Canada, and on the high seas.
Conflict fought between the United States and Great Britain
Population: 7,600,000

Service Members: 286,000

Ratio: 3.8%

Casualties: 2,260 Dead, 4,505 Wounded

Financial Cost in billions (1990s): $0.7

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Revolutionary War (April 19, 1775 – September 3, 1783)

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Revolutionary War (April 19, 1775 – September 3, 1783)

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Fought in New York, New Jersey, and South Carolina
Between the Kingdom of Great Britain and its Thirteen Colonies in America
Population: 3,500,000

Service Members: 200,000

Ratio: 5.7%

Casualties: 4,435 Dead, 6,188 Wounded

Financial Cost in billions (1990s): $1.2