I haven't heard back from you, so you're most probably offline right now. I'll send you the necessary information, and we can take it from there if you need anything clarified. I don't want you to have to wait any longer, especially with me having been traveling this week.
There are limited pathways to obtaining US citizenship or permanent residence. If you are a US citizen, then you can file for their green card if the other person is your fiance, spouse, or sibling.
If they are none of the above, and would nonetheless like to move to the US, they'll have to fit into another category in order for that to be an option. The other categories involve either have a "specialty" training such as in engineering or the medical field, or some other profession for which there may be a shortage in the US-- these categories are called H1 or EB2 visas.
The only other option for moving to the US that your friend could potentially qualify for is an investor visa. The EB5 investor visa is for permanent residence, and the E2 investor visa is nonimmigrant (so it doesn't supply a permanent residence green card). The EB5 investor visa does require a $500,000 USD investment into your company though, so that one has limited attainability.
I hope that helps! Again, sorry for the delayed response since I've been travelling. Please let me know if you have any other questions, I'll be back to the site periodically throughout the day and again tonight. Also, please take a moment to rate me using the stars as this is the only way experts are compensated for our time here on 'just answer'. It doesn't cost you anything to rate me, and we can still continue our conversation for free after. Thanks!