Why did new products like Ivory Soap and Quaker Oats symbolize the continuing integration of the economy in America's Gilded Age?

Question

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Ivory Soap and Quaker Oats were national brands that were sold across the United States thanks to the expanding railroad network. This demonstrates the continuing integration of the economy, as goods were able to be transported and sold on a large scale across the country.

Why Did New Products Like Ivory Soap and Quaker Oats