Deadliest American wars, ranked by deaths of all U.S. military personnel from all causes (battle/other).

1. World War II: 405,399

2. Civil War (Union only): 364,511

(unranked) Covid-19: 229,239 and rising

3. World War I: 116,516

4. Vietnam: 58,220

5. Korean: 36,574
Sources.

Congressional Research Service, ‘American War and Military Operations Casualties: Lists and Statistics,’ July 29, 2020. (See table 1)
https://bit.ly/2TI9fqI 

New York Times, ‘Covid in the U.S.: Latest Map and Case Count,’ Oct. 30, 2020.
https://nyti.ms/2TBlu8C 
The conflict casualty figures in the first tweet of this thread include battle deaths and other deaths. The latter category includes causes such as sickness, homicide, suicide or accidents. Details are in the Congressional Research Service report cited in the second tweet.
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