former Spanish viceroyalty (1535-1821) including, at its greatest extent, Mexico, SW U.S., Central America north of Panama, the West Indies, & the Philippines
See New Spain in American Heritage Dictionary 4
A former Spanish viceroyalty (1521-1821) in North America, including the southwest United States, Mexico, Central America north of Panama, and some West Indian islands. It also included the islands of the Philippines.
The former Spanish possessions in the New World. At its greatest extent, New Spain comprised South America (except Brazil), Central America, Mexico, the West Indies, Florida, and much of the land west of the Mississippi River.