Here's a start:
World War I
Russian Civil War
Finnish Civil War
Cristero War
Spanish Civil War
Irish Civil War
World War II - Germany vs. Poland
World War II - Germany vs. France
World War II - Germany vs. Russia
World War II - Allies vs. Germany
World War II - Allies vs. Italy
World War II - Allies vs. Germany in Africa
World War II - Allies vs. Italy in Africa
World War II - Japan vs. Korea
World War II - Japan vs. China
World War II - Japan vs. Philippines
World War II - Allies vs. Japan
World War II - Japanese theatre
China Civil War
Greek Civil War
Costa Rican War
1948 War of Independence (Israel)
Sinai War (Israel)
Kasmir War (India/Pakistan)
Chinese Occupation of Tibet (whether this is a war is a contested subject)
Korean Civil War (involving Russian, China and the U.S., too)
Sino-Indian War
Indo-Pakistan War of 1965
Indo-Pakistan War of 1971
Vietnam Civil War (involving France and then the U.S., too)
Cambodian Civil War
Guatamalan Civil War
Six Day War (Israel/Many middle-east countries)
War of Attritian (Israel/Egypt)
Yom Kippur War (Israel/Egypt/Syria)
Nigerian Civil War
Lebanese Civil War
Algerian Civil War
First Sudanese Civil War
First Lebanon War (Israel)
East Timor (Indonesia/East Timor)
Russia-Afghanistan War
Salvador Civil War
Ethiopian Civil War
Falkan War (Britain/Argentina)
Iran-Iraq War
US-Iraq Kuwait Liberation War
Sierra Leone Civil War
Serbian War
Rwandan Civil War
Kargil War
Second Sudanese Civil War
US-Iraq Occupation War
Second Lebanon War (Israel)
US-Afghanistan War
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1. World War 2
2. Korean War
3. Vietnam War
4. Desert Storm or Gulf War
5. War on Terrorism
6. Now the war in Iraq
The US has been in 5 wars since 1918.
Hope that helped
Since the end of World War I there has been over 260 major wars in the world. In the United States, the nation has fought one declared war and many other military actions.
160 million + if the spanish flu epidemic after the first world war is attributed to the first world war.
The number of Americans who died in combat is 2,757,196.
In 1914 it was about 7,900,000 by the end of the war it was about 8,200,000
Almost 400,000 in France.
Avoided
British war dead in World War 1 (1914-1918): About 880,000 men from the United Kingdom, plus a further 200,000 from other countries in the British Empire and Commonwealth. (Over 6 million Russian soldiers died.)