I was looking through Susan Williams’s Savory Suppers and Fashionable Feasts, an excellent book about Victorian dining in America, and came across some interesting information she has on the history of dining rooms in America.
In the 1600s – the first century of English settlement in America – only the rich had a specific room set apart for dining. The vast majority of Americans lived in simple one or two room cabins and usually ate around the fireplace that served as cookstove, heater, and light source.
During the 1700s, the idea of having a dining room slowly trickled down to members of the lower upper class. The early 1800s was when the idea of having a dining room really took off, and a large part of the appeal of having a dining room came from new ideas in the middle class.
Williams gives the example of rowhouses built in the 1830s and 1840s in cities like Boston and Philadelphia. They were usually three or 3 1/2 stories tall. The bottom story had a kitchen in the back and a family dining room in front. The second story had a parlor and a formal dining room, while the top story was given over to bedrooms. The functions of the rooms in these three stories neatly fit the idea of separate spaces in the home. In these homes, the bottom floor was productive, the second floor was a public space, and the top floor was a private space.
The dining room, seen as being a public space, sometimes had multiple functions. Williams has a good photo of a dining room from before 1900 with a dining table and enormous sideboard, typical of the time. But the photo also shows a sofa along one wall where the family or visitors could sit and talk. This makes sense, since a dedicated dining room can be a lot of real estate for a room that might not be often used.
Of course, dining rooms today are often joined to the kitchen, making a more open and informal space where people sitting at the table can easily talk to the cook. The idea of productive/public/private space has disappeared, replaced by only a differentiation between public and private space. While the kitchen can be productive, we no longer have the idea that it is. Now, kitchens are seen as being a type of public space, where guests can easily enter when visitors are over.