Which ancient civilization was the first to invent the plouhs?

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http://wiki.answers.com/Q/Who_invented_the_first_plough

The ancient Sumerians, who lived in Mesopotamia (modern-day Iraq) around 4000 BCE, were the first civilization known to have invented the plough. To confirm this, we can follow these steps:

1. Start by conducting a search using a reliable search engine, such as Google.
2. Enter the keywords "first civilization to invent plough" or a similar question.
3. Look for reliable sources that provide information on the topic. Academic websites, archaeological studies, or reputable history books are good options.
4. Verify the information by cross-referencing multiple sources to ensure accuracy.

By performing these steps, you will be able to find the supporting evidence that the ancient Sumerians were indeed the first civilization to invent the plough.