I would like to find out how specifically to adopt a child under 8
years old who has been orphaned in the recent Tsunami in South Asia. I
live in Denver, CO, USA.

This organization is top notch:

http://www.wacap.org/

U.S. Department of State

Update on Adoption of December 26 Tsunami Victims
http://travel.state.gov/family/adoption/notices/notices_2017.html

Just a thought:

it would be SO much better for them if they could be adopted in groups
of two or more.  Imagine the difficulty of dealing with PTSD and being
brought to an entirely different culture with not one scrap of
familiarity.  I wonder if the US will accept refugees?  We will see,
anyway, from my somewhat limited experience with adoptions from
foreign countries, they seem to thrive more if they are adopted with
siblings, friends if no siblings survived. Just a thought.