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The first modern war was the crimean war. In the 1800s, the Ottoman Empire was instructed by both France and Russia to protect Catholic and Orthodox Christians that were within its empire. These two instructions conflicted and the Ottomans chose to side with France. Seeing an opportunity to limit Russian expansion, Britain, Austria and Prussia also support the "Allies" (France, Ottomans). This angered Russia and it invaded the Danubian Principalities in 1853, as well as destroyed the Ottoman Black Sea fleet at the Battle of Sinop.
The Allies then sent an ultimatum (which was accepted by the Russians) but didn't stop the attack. They landed on the Crimean Peninsula and began the Siege of Sevastopol (the Russian naval base). Twice, the Russians tried to break out, including once at the Battle of Bacalava. This battle witnessed the famous Charge of the Light Brigade (which ended in a slaughter of British cavalrymen). Eventually, the Russians surrendered and the Crimean War ended.
The first war that involved the US Army was the war of 1812. The Continental Army fought against Britain in the Revolutionary War.
The Mexican War of 1846-1848 was a declared war.
The Korean War was the FIRST war in US History in which they were "Officially Integrated" into the US Military forces.
* world trade center * gulf war * Iraq war * first black president
Revolutionary War
While certainly an important event in US history, the US Civil War didn't "lead" or "start" the study of US History.
The Us Civil War was the bloodiest war recorded in US history.
The statement that US history is not taught past the Vietnam War is not correct. US colleges and secondary schools have quite different US history boundaries. There is a mass of US history running past the War in Vietnam.
With defeat of Spain, the US became a world power for the first time
Traditionally it has been the US Civil War and WW2.
The American Civil War
The first Iraq War was fought to drive Iraq out of Kuwait. - And BTW - a few Allies helped. It was not entirely a "US war"