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B. The purpose of the site is to provide information on military uniforms worn in the Vietnam War.
Washington Gladden's ideas would most closely be tied to Reconstruction period in United States history. The correct option among all the options that are given in the question is the fourth option or option "D". Washington Gladden was a minster and a pastor and he was helping in the reconstruction of religion.
A form of collective social behavior that persists over a long period and gradually finds place as a tradition is called a custom. Examples:
Drinking a glass of wine with each meal--French custom (although that might changing due to economic woe and other variables)
Saying a prayer before each meal--Latin American custom (although it's a custom in other places too, and not every Latin American does this)