history behind the 11th hour of Veteran's day

Philippines
November 11, 2009 7:40am CST
It is veteran's day once again in US and that's what I usually read in news update online. One thing though is that on the 11th hour of the 11th day of the 11th month back in 1918 was the time when World War I officially ended. I'm just wondering if this is really the beginning of veteran's day or the celebration followed few years after?
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