so they could trade with other places.
so they can trade,comunicate with other places
because they wanted to talk without opening their mouth
Here's a link to show you how writers invent place names.
to communicate
For the same reasons anyone needs one, for calculation and record.
You need to invent your own titles -- the title should come out of your creative writing, not from some anonymous person on the internet. The title isn't really important anyhow, and you don't even invent it until you're done with writing.
do you need an apostrophe after the s in Koreans
Geography does not lead to writing. The need to communicate and record things leads to writing. Prosperity in Mesopotamia arising from the productivity of the land brought a need for communicating and recording.
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The form of writing where pictures stand for ideas is known as "pictography." In pictographic writing systems, symbols or images represent concepts or objects, allowing for communication without the need for a phonetic alphabet. This form of writing was used in ancient cultures, such as the Egyptians with hieroglyphics and the Sumerians with cuneiform, where visual representation conveyed meaning.
Humans really do not need a lot of things to invent a tool. All a human needs are there minds.
If you're going to be a writer, you need to learn how to invent names for yourself. Here's a link to a question that teaches you how to invent good place names.