The Battle of Fort Sumter, South Carolina.
The first battle was the attack at Fort Sumter (a union fort in SC), and the only few deaths were one confederate horse and a man who was standing near a dud explosion for the salute and was injured and then died.
The first war on what is now American soil would have been one that was fought between Native Americans. However the first war to be fought by people claiming US citizenship was the Revolutionary War. All other wars and skirmishes up until that point (including Bacon's Rebellion and the Seven Years War/ French and Indian War) were fought by Colonists who, while living in "America" were still subjects of the British Crown.
As the United States wasn't recognised as a country until 1780 or thereabouts there must have been many thousands of battles fought before the country came into existence. The Romans alone fought hundreds of battles in their conquest of Europe.
Other than the frontier wars, the War of 1812 (against Britain). America was not the US during the Revolutionary War (1776).
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To what end? The US gained no territories as a result of the First World War.
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The American Revolutionary War began in 1775. The US Civil War began in 1861. Therefore the Revolutionary War was before the Civil War.
France after the revolutionary war
The First Barbary War
The first war that involved the US Army was the war of 1812. The Continental Army fought against Britain in the Revolutionary War.
The Korean War was the first war fought by the USAF.
War of 1812
The Korean War was the first officially intregated US war. It was also the newly formed US Air Force's FIRST war.
The first US draft was during the US Civil War (1861-1865); the last US draft was during the Vietnam War (1961-1975).
1. First war fought by the USAF. 2. Worlds first "jet" war.
Germany
The First Gulf war
The US revolutionary war
First, US Civil War; Last, Vietnam War.
Our first offensive for the pacific war the battle inGuadalcanal