Welcome to the magical, mythical world of J.R.R Tolkien!
Laurelin is indeed the most immersive (and friendly) server I have ever experienced in LotRO from all the realms I have played on. It is true that it was a EU server, but that was two years ago I think by now; since Turbine took over the overall population has increased greatly especially during the time that folk from US play.
This is the only official English-speaking RP server of LotRO thus it draws many people who want to experience the game in a more immersive and story-driven way. You (and others) will find plenty fans of the books here too.
There are quite a few actually N/A kinships on Laurelin.To make it easier for you, I will link here some of the Kinships (that I at least know) that have many people who play from America therefore are active during your playtime:
The Iron Axes, Esquires of the Riddermark (for men/women of Rohan) The Company of the Rising Dawn and the Out of Bounders as it is mentioned in your other thread. Read the website of each and see what you prefer best.
With that said few other things that you may want to at the very least be aware of: the global channel of the server where one can find others to form a fellowship for raids/pvmp/group-content, is globallff (and glff too) Hundreds of people there although if you take my counsel use it only when you need to and then leave and re-join it again when you want to form a group.
And as I read that you are a Tolkien-fan, I deem it good for you to know that Laurelin has a chat-channel in-game that is for all the the fans (and rpers) of the Middle-earth legendarium. It is better to have a look for yourself at the Official Page for it that explains all about it.
Last but not least, have a look on Laurelin Archives, the RP Webportal of the server where almost all events and kinships of the server are listed; that and much, much more as you will see.
Good fortune. May your stay be long and enjoyable on Laurelin the Great; a jewel among all the servers of LotRO!
[CENTER][URL="http://laurelinarchives.org/node/12497"]A place in-game for all fans [SIZE=1](and roleplayers)[/SIZE] of Tolkien's world. Enter friends and experience Middle-earth.[/URL][/CENTER]