Editing Sydney, Nova Scotia (section)

===Post-war years 1950–2014===
By the late 1960s the coal and steel industries had fallen on hard times.{{sfnp|Star Staff|1967|p=1}} Friday, 13 October 1967, became known as "Black Friday," so named after [[Hawker Siddeley Canada]], the plant's owners, announced they were closing it in April 1968.{{sfnp|Doyle|2011|p=220}} Both the provincial and federal government were involved in negotiating with the steel plant's owners, when Cape Breton's citizens held the largest protest in the city's history on 19 November 1967: "The Parade of Concern."{{sfnp|CP Special|1967|p=5}} Around 20,000 people marched about a mile from the plant's gates to a horse racetrack to show their support for the steel plant.{{sfnp|CP Special|1967|p=5}} Newly appointed Nova Scotia premier [[George Isaac Smith|G.I. Smith]] and federal Health Minister, and Cape Breton MP, [[Allan MacEachen|Allan J. MacEachen]] spoke to the crowd and assured them that their respective governments were going to help.{{sfnp|CP Special|1967|p=5}} Four days later the Smith government announced that they were taking over the plant starting in 1968.{{sfnp|Special to the Star|1967|p=1}}

Both the steel and coal industries continued under government ownership for the rest of the 20th century. By the early 1990s, both industries were in trouble again, and were permanently closed by the end of 2001.
Forced to diversify its economy after the closures of the steel plant and coal industries, Sydney has examined a variety of economic development possibilities including tourism and culture, light manufacturing and information technology. Cleaning up the former steel plant, and the toxic [[Sydney Tar Ponds]] it left behind in Muggah's Creek, were a source of controversy due to its health effects on residents, although it has provided some employment since SYSCO closed.<ref>Walker, T. R., MacAskill, D., Rushton, T., Thalheimer, A., & Weaver, P. (2013). Monitoring effects of remediation on natural sediment recovery in Sydney Harbour, Nova Scotia. Environmental Monitoring and Assessment, 185(10), 8089–8107. https://doi.org/10.1007/s10661-013-3157-8</ref><ref>Walker, T. R., & MacAskill, D. (2014). Monitoring water quality in Sydney Harbour using blue mussels during remediation of the Sydney Tar Ponds, Nova Scotia, Canada. Environmental Monitoring and Assessment, 186(3), 1623–1638. https://doi.org/10.1007/s10661-013-3479-6</ref><ref>Walker, T. R., MacAskill, D., & Weaver, P. (2013). Environmental recovery in Sydney Harbour, Nova Scotia: Evidence of natural and anthropogenic sediment capping. Marine Pollution Bulletin, 74(1), 446–452. https://doi.org/10.1016/j.marpolbul.2013.06.013</ref><ref>Walker, T. R. (2014). Environmental effects monitoring in sydney harbor during remediation of one of Canada's most polluted sites: a review and lessons learned. Remediation Journal, 24(3), 103–117. {{doi|10.1002/rem.21397}}</ref> The tar pond cleanup was completed in 2013 with the opening of Open Hearth Park, which sits on the direct site of the former steel plant and has hosted events such as an [[Aerosmith]] concert in September 2014.