Dearest (best friend's name),
I hope this letter finds you well. I'm writing to you today to share some exciting news: I've started the process of naturalizing as a U.S. citizen!
I know you're already a citizen, so you may be wondering why I'm going through this process. Well, the short answer is that I've been living in the U.S. for over 10 years now, and I feel like it's time to make it official. I love this country and everything it has to offer, and I want to be able to participate fully in the democratic process.
The naturalization process is a bit daunting, but I'm up for the challenge. I've already started gathering the required documents, and I'm scheduled to take the citizenship test in a few months. I'm a little nervous about the test, but I'm confident that I'll be able to pass it.
I know that you became a citizen through marriage, so your process was a bit different than mine. But I'm sure you can relate to the feeling of excitement and anticipation that I'm feeling right now. I can't wait to officially become a U.S. citizen and start calling this country my home.
I'll keep you updated on my progress, and I'll be sure to let you know when I'm sworn in as a citizen. In the meantime, I hope you'll join me in celebrating this milestone in my life.
Thanks for being such a supportive friend. I couldn't do this without you.
Love,
(Your name)
P.S. I know you're busy, but I would love it if you could come to my naturalization ceremony. It would mean the world to me to have you there.