Immobilisers have been mandatory in all new cars sold in Germany since 1 January 1998, in the United Kingdom since 1 October 1998, in Finland since 1998, in Australia since 2001 and in Canada since 2007.
Unfortunately in the good old US of A that is somehow not the case, but it remains a fact that it is a bare minimum requirement for vehicle security. You will not purchase a vehicle in America that is not a Kia that does not have an immobilizer.