I would like to know more about the project, but to be quite frank, $5 for 1000 word articles is far below the average pay in the U.S. I can meet all of your requirements, but the lowest I would be able to work for a well researched 1000 word article is about $35 per article, depending on the amount of research needed.
Let me know if you're interested. I am a native born U.S. English speaker and writer.
Thank you for considering my proposal.