Is Singapore a state of the USA?

The media has reported widely about the corruption case involving Keppel
O&M and a Brazilian company. And somehow the US Justice Dept is the
authority on this case as if it has jurisdiction over Keppel O&M
operating in Brazil or jurisdiction over commercial crimes in Brazil.
Below are some details of the case posted by Kenneth Jeyaretnam in TRE.
 
‘Quietly over Christmas the US Justice