Since they were the ones controling production of food. They were able to produce enough food themselves. Also, civilization started due to people gathered at one place for farming.
Is this a question or are you trying to check your answer. Either way, your answer is correct!
Developing countries still may not have a fully literate population, or widespread internet access, a well functioning policing and fire services. Developed countries have all these things.
just a few examples, you can come up with hundreds
