Can americans have titles like "lord" or "duke"?

Question

my husband and i were talking and we weren't sure if an american citizen is able to have a title like "duke" or "lord" or something (being knighted doesn't count). can they? or would they have to be a citizen of the country in which the title is held (since america doesn't have dukes, etc)?

just curious! thanks!

Answer 1

 Lots of American citizens, such as George Bush and Bill Gates, have knighthoods from the UK.