Mahdist War happened in 1881.
Iberian War happened in 526.
Yakima War happened in 1858.
Babylonian War happened in -311.
War of the Regulation happened in 1770.
Toledo War happened in 1835.
As of August 2014, there is not another Civil war about to happen in the US.
World War 2
Jack squat
the war happen in 1955 to 1975
the creek war happened in 1865
War of Urbino happened in 1517.
Ifni War happened in 1958.
Victorio's War happened in 1879.
Perusine War happened in -40.
Scanian War happened in 1675.
Order of War happened in 2009.
Lazic War happened in 541.