Known for scam also know as the 519 419 scam, Nigeria has successfully elevated itself to be known universally for this.

Britons now closely associate the African country with the so-called “advance fee” scam whereby people are contacted by e-mail and offered the opportunity to earn millions of dollars. The recipient is told they will earn a commission in exchange for aiding the sender in transferring funds.

Source: Nigerian scams cost Britons millions, says study – Yahoo! News

I know my UK email address is inundated with these scams, whereas my US based gmail is not.   For the life of me, I cannot imagine people getting hooked, but it appears people still are.