White mulberry trees, also known as Morus alba, have been cultivated in the United States since the early 17th century. These trees were initially brought to the country in an attempt to launch a silk industry that was ultimately unsuccessful. It is believed that this plant originated in China, where it has served as the primary source of nutrition for the silkworm for almost 5,000 years. Many states in the United States now classify the white mulberry as an invasive species because it has become naturalized across a large portion of the country. It is regulated to such an extent because of the species' prodigious ability to hybridize with other species and to outcompete native species like Morus rubra, which are important to the ecology of the area.
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