The Korean War lasted from 1950 to 1953
The UN fought in the Korean War (1950-1953). The UN also authorised the war in Yugoslavia and the first Gulf war.
The Korean War (1950-1953) & The Vietnam War (1961-1975) were "Hot" battles of the "Cold War."
There isn't a specific answer to that
Most famously the Korean and Vietnam Wars, although there were others.
The Copper Wars (between miners and mine owners) and some of the Indian wars were fought in Idaho.
No. The Crusades were wars fought between Christians and Islam.
The Punic Wars.
There were four "Wars for Empire" fought between 1689 and 1763.
No. Wars between Greek city-state alliances were fought by the citizen armies of the states.
England and China
Iroquois
Athens and Spartans