You are confusing the World Bank with the Ex-Im Bank, again.
You are the one who is confused, and don’t start in on me again. You have submitted me to some of the most ugly and uncalled for hectoring on this forum before. Anyway, the Ex-Im Bank is solely operated by the United States government. It is an independent agency of the federal government under the Export-Import Bank Act of 1945. The World Bank, though located in Washington, DC, is not an agency of the US government. Here is a link to the E-I Bank, which provided both Petrobras and Pemex with the goodies:
http://www.exim.gov/