Final answer:
The areas of present-day Florida, New Mexico, and parts of Texas were colonized by Spain. Spain's colonization efforts were marked by the establishment of settlements and the encomienda labor system.
Step-by-step explanation:
The orange area comprising present-day Florida, New Mexico, and parts of Texas was colonized by Spain. This colonization included the setup of the encomienda system for labor, and settlements such as St. Augustine in Florida, which is the oldest colonial city in North America, founded in 1565. Spanish territories in the Americas were extensive, including much of the Southwest and Central America.
However, due to political changes and treaties such as the Adams-Onís Treaty, which resulted in Spain ceding Florida to the United States, Spain's influence in these territories diminished over time. The decline of Spanish control continued as Mexico gained independence and later when Texas achieved independence from Mexico. Colonization efforts by Spain were characterized by the establishment of missions, the exploration, and the management of resources through systems like the encomienda.