New York: The US' legislative process is Darwinian. Thousands of bills are introduced in Congress every year. Only close to 3% in recent years are passed, the rest left to languish in committees and subcommittees before dying unceremonious deaths.
No one knows what makes for the 'fittest' bill that survives the legislative process. It's generally the more inconsequential a bill is, the faster it becomes law. The less controversial it is, the more likely it is to pass. Bills commemorating 'National Lobster Day' or 'National Blueberry Month' are passed without much hassle.