Question: According to the Wikipedia page for the [Oxford Comma](http://en.wikipedia.org/wiki/Serial_comma#Arguments_for_and_against), "Use of the comma is consistent with conventional practice" and "Use of the comma is inconsistent with conventional practice." Did the Oxford Comma come before its omission, or was the Oxford Comma traditionally omitted?

It makes logical sense that every item in a list would be separated in the same way: by a comma. If the Oxford Comma is conventionally correct, when and why did people begin to omit it?

Answer: 
There are situations where use of the [Oxford comma](https://en.wikipedia.org/wiki/Serial_comma "(a.k.a. serial comma or series comma)") will make or break a sentence.

**Choose a style and *be consistent*.** When you run into a situation in which your choice suggests a misinterpretation of the sentence, rewrite it in another manner to avoid the confusion.

Consider these two pairs where the Oxford comma makes (1) or breaks (2) the intention:

> 
> **Oxford comma:**
> 
> 
> 1. *We invited the strippers, JFK, and Stalin.* = Strippers and JFK and Stalin.
> 2. *We invited the stripper, JFK, and Stalin.* = JFK (the stripper) and Stalin.
> 
> 
> **No Oxford comma:**
> 
> 
> 1. *We invited the strippers, JFK and Stalin.* = Strippers named JFK and Stalin.
> 2. *We invited the stripper, JFK and Stalin.* = Stripper and JFK and Stalin.
> 
> 
> 

A picture (from [Joe Kessler's blog](http://lesserjoke.tumblr.com/post/17114988391/captainrobocop-politicalprof-the-oxford)) to better illustrate this:

[![The Oxford comma alters the subjects of these sentences](https://i.stack.imgur.com/spQkb.png)](http://lesserjoke.tumblr.com/post/17114988391/captainrobocop-politicalprof-the-oxford)
If find the Oxford comma to give fair representation to how people speak. When listing items in speech, equal pause is given between each item. For me, the Oxford comma emphasizes that there is, indeed, a pause before the 'and' preceding the last item of the list.

I think the Oxford comma also indicates the direction of the sentence -- it makes it clear that you are reading from a list. Often I find myself rereading sentences that don't make use of the Oxford comma because, on the first pass, I have misunderstood what they are saying.

But, as your question points out, many do not use the Oxford comma (e.g., The New York Times).