1
general::
On account of, because of, as in Thanks to your help, we'll be done on time. This phrase alludes to gratitude being due to someone or something. It is Also put negatively, no thanks to, meaning "without the benefit of help from," as in We finally found your house, no thanks to the confusing map you drew. This usage, first recorded in 1633, is about a hundred years older than the first term, recorded only in 1737.
American Heritage Idioms
2
general::
Phrase(s): thanks to someone or something
due to someone or something; because of someone or something. (This does not necessarily suggest gratitude.) • Thanks to the storm, we have no electricity. • Thanks to Mary, we have tickets to the game. She bought them early before they were sold out.
McGrawhill's American Idioms And Phrasal Verbs