Question for Teachers or Grammar Experts
We are having a family debate and need some help from English teachers and/or Grammar experts. Any back up would be helpful as well.
Here are two examples of sentences...please tell us which one is correct in regards to using a comma:
1) While Mary was traveling through the East Coast she stayed overnight in New York, Pennsylvania, and Maine.
OR
2) While Mary was traveling through the East Coast she stayed overnight in New York, Pennsylvania and Maine.
We appreciate any feedback...
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