The United States Constitution is silent regarding rules of how a constitutional convention would operate. There are no standards for states calling for a convention. Even calls for a constitutional convention made 50 to 100 years ago on an entirely different topic might be counted towards the required 34 states needed to call a constitutional convention. Oklahoma, for example, called for a convention in 1976 but then rescinded it in 2009. They were concerned that such a convention might make unforeseen changes in any area of the Constitution. Those in favor of a constitutional convention may want to count Oklahoma's call for a convention anyway.