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Viceroyalty of New Spain, the first of the four viceroyalties that Spain created to govern its conquered lands in the New World. Established in 1535, it initially included all land north of the Isthmus of Panama under Spanish control. This later came to include upper and lower California, the area that is now the central and southwestern portion of the United States, and territory eastward along the Gulf of Mexico to Florida. The Viceroyalty of...