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The 222 years thing is very much open to interpretation. If the US were known to use military personnel abroad in a year, that was deemed as being at war in that research.
If I am going to be really pedantic, war is a legal status and the US have only technically been at war a handful of times.
Edit: The only formally declared US wars were 1812, Spanish-American, Mexican-American, WWI, and WWII.
222 out of 239 years according to this:
http://www.globalresearch.ca/america-has-been-at-war-93-of-the-time-222-out-of-239-years-since-1776/5565946
So, 21 years not at war with someone.
Not sure about the UK.
Marvellous, isn't it?