The headquarters of the United States Congress. Precisely for this reason, all non -essential administrative activities stop, being no longer financed, until the definitive approval of the federal budget. This procedure is not new for the United States: from 1975 to today 20 have already been recorded shutdown. Specifically, all employees engaged in essential federal services (such as the Department of Defense, Health, Commerce and even NASA) will continue to worker without perceiving a salary. The previous Shutdown of US historyThe shutdownhowever, are not new for the United States: nevertheless, over the past few decades cases have increased exponentially, with 20 shutdown that occurred from 1975 to today.