31
31 tanks to Ukraine.
Such a random #
31 Oct, 1931 - U.S.A. Gold Standard
1931 : Following the announcement that Great Britain had decided to abandon the Gold Standard in mid-September a mini panic occurred when people were worried their money was not safe in local banks, the panic caused people to draw savings from the banks which in turn placed more pressure on the banks than the 1929 stock market crash had already, because of this by 31st October 827 banks were forced to close.