All out total declared wars...until 1945 and the atomic bomb. From that date (1945) onward (to today), limited wars (Korea and Vietnam); and Military Operations (Urgent Fury-Grenada, Just Cause-Panama, Desert Storm-Iraq, Restore Hope-Somalia, Iraqi Freedom-Iraq, Enduring Freedom-Afghanistan, etc.) are now the norm.
In the 19th century to the early 20th century were known to be short wars. These wars were fought to see who got control f the state. This meant who ever got control of state got the capital and the military could crush resistance.
20th century by far.
Multiple wars were fought in the 20th century. A Few are World War One, World War Two, Korean War, Vietnam War, and the Gulf War. All these wars involved the US Military.
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In some way or another, most, if not all of the war's (involving modern nations) fought in the 20th century effected some sort of social reform.
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The 20th century was an age of war because during that time period there were many and great wars that were faught. Also many people were killed during the wars that occured during the 20th century.
There are many wars which were fought at the end of the nineteenth century. Some of these wars include Franco-Prussian War, Crimean War and Napoleonic Wars among others.
England in the 16th Century, Russia and Spain in the 20th Century. Also, in ancient times the Roman Republic fought a number of civil wars before the Roman Empire was established.
World War II took place in the 20th century (1900s)
For the first time the Union and Confederate armies no longer marched out in the open and fought parade style (except in the very beginning of the war). They dug in, and fought the way 20th century wars would be fought.
There were four "Wars for Empire" fought between 1689 and 1763.