Bulgaria–United States relations to work. Bulgaria became a member of the Warsaw Pact on May 14, 1955. Though no Soviet troops were stationed on Bulgarian soil, in 1968, Zhivkov sent a Bulgarian division to join Polish, Hungarian and Soviet troops to crush a popular uprising in Prague. In 1978, the Bulgarian secret police were implicated in the assassination in London of Georgi Markov, a Bulgarian dissident who was a correspondent for the BBC World Service, Deutsche Welle radio and the U.S. sponsored Radio Free Europe. Markov was assassinated with a poisoned umbrella on September 7, Zhivkov's birthday. The rise of democratic movements across
Waterloo Bridge, Betws-y-Coed imaginatively-designed iron road bridge by Thomas Telford, engineer, a significant example of early iron technology". Waterloo Bridge, Betws-y-Coed Waterloo Bridge () is an early cast iron bridge, spanning the River Conwy at Betws-y-Coed, in Conwy county borough, north-west Wales. The bridge is located about half a mile south-east of the village. It was built by the civil engineer Thomas Telford. An inscription on the arch records that it was constructed in the year of the Battle of Waterloo, but although designed and constructed in 1815, its erection was not completed until the following year. It was raised as part of