As a step in the relationship
you can use resources to figure it out I use Plato to and it can be vague so it took digging to find the answer
Internet: Websites should be from credible web addresses ending in .edu (an educational institution), .gov (government agency), or .org (non-profit). Any web pages that end in .com (commercial) or .net (networks) should be reviewed with caution.
Books, newspapers, and magazines: Examine the author’s qualifications. He or she should be educated in the field of nutrition/dietetics, and preferably hold a degree from an accredited university (RD, DTR, LD, or MD). These individuals should also belong to a credible nutrition organization.
Television: Make sure that the findings are well researched and repeatable; one study doesn’t make a finding absolute. Be critical and look for follow up studies.
For all media sources: Make sure the information is referenced with cited sources. Seek out multiple perspectives regarding nutrition advice, and ask a nutrition expert about the source of the findings. Ensure that the information is current and informing, not attempting to advertise or sell a product.
Answer: For people to grow more crops in their larger distance of land and have more labor.
We know this thanks to archaeologists who excavated many places and discovered that many early civilizations gathered around large rivers where they could develop agriculture. This was seen in places such as Mesopotamia, India, China, Egypt, etc.
Regulate interstate (between states) and international trade
