Hunting also has a significant financial impact in the United States, with many companies specialising in hunting equipment or speciality tourism. Many different technologies have been created to assist hunters, even including iPhone applications. Today's hunters come from a broad range of economic, social, and cultural backgrounds. In 2001, over thirteen million hunters averaged eighteen days hunting, and spent over $20.5 billion on their sport.[citation needed] In the US, proceeds from hunting licenses contribute to state game management programs, including preservation of wildlife habitat.
Try to answer this question if possible (otherwise reply "unanswerable"): What is one cause that was most supported by IPhone users in 2001?
unanswerable