It started with the second grand prix to be contracted by Formula One Management, namely Bahrain's 2004 race, and has continued ever since: fixtures staring cancellation in the face; in some instances, such as New Jersey's stillborn round, being canned even before the inaugural event.
Others, like Korea and India, joined Bahrain in staring cancellation in the face until the very last minute due to construction/organisational hiccups, with both (plus Valencia's torpid street grind and Turkey) now off the schedule indeterminately.
Even Malaysia stood in dire danger until weeks before its first race in October 1999, but that was overlooked at the time due to the impact on the championship of Michael Schumacher's Silverstone crash and the elevation of Ferrari team-mate Eddie Irvine to title challenger.