you can search around the CIA factbook online at:
http://www.cia.gov/cia/publications/factbook/
Certain countries (possibly Latvia I think) are identified as having weak anti-money laundering systems in place. Therefore, having an account in that country and transferring money from it to a US Bank account might raise red flags.
for an example look at the mention on Dominica on the bottom of the page at:
http://www.cia.gov/cia/publications/...s/do.html#Econ
Dominicia is one of the many countries in the Carribean that offer online offshore banking, but as it is identified as easy to launder money there you may want to avoid it!