The War of 1812 did not involve the United States and the United Kingdom.
 For instance, during the Seven Years' War, the Royal Navy reported it conscripted 184,899 sailors, of whom 133,708 (72%) died of disease or were 'missing'
This is one of the earliest expressions of what has come to be called the Malthusian theory of war, in which wars are caused by expanding populations and limited resources

