Final answer:
The warm climate, broad coastal plains, and rich farmland describe the Southern colonies in colonial America, characterized by plantation agriculture.
Step-by-step explanation:
The environmental conditions described in the question such as broad, coastal plains and hilly forests, year-round warm climate, and rich farmland best characterize the Southern colonies during the colonial era of America. These regions, like South Carolina and Georgia, had climates that supported the growth of cash crops like rice and indigo, which were labor-intensive and often required the use of slave labor. The natural features of these areas, which include broad coastal plains and hilly inland forests, provided a conducive environment for large plantations and agricultural prosperity.