Here's why:
* Proper nouns are specific names of people, places, or things. They are always capitalized.
* Common nouns are general names for people, places, or things, and they are not capitalized unless they are at the beginning of a sentence.
Example:
* "She traveled to the South." Here, "South" refers to a specific region, making it a proper noun.
Important Note: While "South" is often used as a proper noun to refer to a specific region, it can also be used as a common noun if it is not referring to a specific place.
Example:
* "The wind was blowing from the south." Here, "south" refers to a direction and not a specific region, so it is a common noun.