I have not adopted internationally but, do know several families who have. I feel it is best for our children to know and honor their heritage but, I don't think it is as important to find Guatemalan friends as it is to understand the culture and history.
A funny story: My ex husband was adopted as a new born into a Scottish family--VERY Scottish....So Scottish in fact, I had to basically beg my husband NOT to wear a Kilt (Skirt) to our wedding

Our son has about the most Scottish name a human could be given and our lives were filled with all sorts of Scottish food, trips and culture up the Wa-zoo....Tartans, flags, coats of arms....there was even talk of bag pipes! ANYWAY--THE FUNNY Part is that last May he found his birth parents and WE Learned that our children are at least 1/4 American Indian! Who would have EVER Guessed?!
Today, our children are in college and they have been having the time of their lives researching their Tribe and learning about their family heritage. At Christmas my kids went to a party with ALL of their fathers Biological family and met everyone. They told me a story that just cracked me up.....during some conversation my ex's birthfather made a joke about them being the "Scottish" side of the family!
I actually, found this to be an interesting remark and one that makes me want to meet my kid's biological family even more! I thought it was kind of an honor and cute to give my ex-husband and my children the Right to Keep the heritage they all grew up with.....
Fact is none of them have one drop of Scottish blood in them....But, they are all Scottish by adoption....no one needs to change last names or give up the Kilts and bag pipes....but, it has been fun to learn the other part of who they are. And I haven't even discussed the Irish side of the family--or the Germans who snuck into the woodwork along the way---If they were actually German because some family rumors say they may have actually been Jewish....
I guess that is why I just try to be American.... I think that a large number of us are pretty much a bunch of things.
I plan to teach my children about all the history of both sides of the family...and what we know about their biological families..... Just the same way that I love being Irish yet had to actually do my own research to find out where and how I became Irish....
I think the key is to instill PRIDE about our children's heritage....some kids will be more interested then others and a lot of the things we teach our children is in response to the interest they actually have. Exposure to culture, art, music and history from our native origin is great and sparks interest in learning about our history...But, some kids will care less and show little interest--other children will drink it up....