In the United States, the 1930 Smoot-Hawley Tariff Act defined antiques as, "...works of art (except rugs and carpets made after the year 1700), collections in illustration of the progress of the arts, works in bronze, marble, terra cotta, parian, pottery, or porcelain, artistic antiquities and objects of ornamental character or educational value which shall have been produced prior to the year 1830." 1830 was the approximate beginning of mass production in the United States. These definitions were intended to allow people of that time to distinguish between genuine antique pieces, vintage items, and collectible objects.