American Style of punctuation
Definition - The punctuation style in which commas and periods are placed inside closing quotation marks. This style is common in the US and Canada, and is mandated by the Chicago Manual of Style and other American style guides.

As opposed to the British Style of punctuation, where only those punctuation marks that belong to the quoted material are placed within the quotation marks, and all other sentence punctuation is placed outside.

Example -

(1) (American Style) "Happiness," said the ambassador "is what I seek."

(2) (British Style) "Happiness", said the ambassador "is what I seek".

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