Renouncing British Citizenship NI?

[shrh8795]

Hi all, just registered after to reading through the site I need some advice!
I was born and lived in Belfast my whole life, I've always identified myself as Irish, my past two passports have been Irish. However,
I think my mother had a British Passport for me as a child since it was faster at that time.
My question now is, I'm marrying a US citizen in a few months, originally we were going to apply for a visa for me to live in the states after marrying but I have since gotten an offer for a job/training that lasts 3 years. My partner is willing to move here but we're confused as to how?

Can I renounce British citizenship since I have had a British passport in the past?
I looked at the form, am I a British national, citizen or what?
After I renounce citizenship and continue having Irish passports can I apply for the eea (I think thats it)?
If yes, can he work in the North?

So key details if I was unclear as this is a bit rushed

- I have an Irish passport
-Had a British passport as a young child
- Live and was born in the North not the Republic
- He is from the US
- Can he live and work in Northern Ireland?

Thank you all for the help in advance! I am clueless as we spent our time researching how I can move there!

[fwd079]

- I have an Irish passport
-Had a British passport as a young child
- Live and was born in the North not the Republic
- He is from the US
- Can he live and work in Northern Ireland?

UK and Ireland both allow dual nationality and since you had a British Passport so you are British, as a British person you can apply for his spouse visa after getting married and that visa would mean he can work in UK. The unmarried partner it seems, has difficult conditions.

You can ask about Irish visa processes in this link which has Irish immigration information.