Along with this altered timeline came a slowed development of technology keeping the world of July 1987 at a roughly 1940s level, as no jet engines, television, atomic weapons, nor computers were ever invented (with the exception of command logic machines), but helicopters do exist without turbine propulsion and the preferred means of telecommunications in this time is by VHF radio. Political changes were slow as well, for no international communities (the League of Nations or the UN) were established either, and some countries still practice human slavery.