Since the early 1950s, a renaissance occurred in the development of cultural institutions and abatement of pollution in Pittsburgh and its surrounding area. The effects of this increase in livability are particularly apparent in the Golden Triangle district of Downtown Pittsburgh, which at one point had been plagued with so much industrial haze that drivers used their headlights in mid-day. However, this social improvement has not always been accompanied by a serious plan of regional economic development to assess what, precisely, should fill the income void after the departure of steel. In addition, the city of Pittsburgh continues to become de-populated and has recently been put under state supervision of its finances. Culturally, the distinctiveness of Western Pennsylvania is underlined by the existence of a unique local dialect called "Pittsburghese" or Pittsburgh English, sometimes affectionately termed the "yinzer" dialect, due to its use of the term "yins" (also spelled "yunz, "yinz", "youns", etc.) as the plural form of "you". This is probably a legacy of Ulster-Scots settlement in the area. Western Pennsylvanians also refer to soft drinks as "pop" while in the eastern half of the state it is referred to as "soda." The Erie Triangle and the city of Erie give Pennsylvania a port along the Great Lakes. This region in unique within western Pennsylvania in that it maintains stronger geographic and cultural connections with western New York than it does with western Pennsylvania, due in large part to its identification with the eastern Great Lakes region, rather than Appalachia. This is reflected in the city and county of Erie sharing far more similarities with Buffalo and southwestern New York than it does with Pittsburgh and western Pennsylvania. The Erie region is also known for its distinct agriculture, centered on grapes and other fruit, due to the moderating climatic influence, in both summer and fall, of Lake Erie. (In winter, the area is often inundated with "lake-effect" snow.) There are also small commercial fresh-water fisheries and many streams and smaller lakes with a variety of fish to catch, including yellow perch and walleye. In Stonycreek Township is the memorial and crash site of United Airlines Flight 93, the "Let's Roll" flight which occurred on 9/11 in 2001 after passengers attempted to overpower the plane's hijackers. The site is an informal patriotic shrine with many hand-made mementos voluntarily gracing the area. There is a movement to add the site to