In 1948, the “Pasadena Shares Committee” sent packages of blankets, clothing, food, and medicines to help the residents of post-war Ludwigshafen. Many friendships started to form, so that in 1956, Ludwigshafen am Rhein and Pasadena, California became sister cities. Large parts of the city were literally ruined, which were rebuilt in the architectural style of the 1950s and 1960s. The most important projects were the Hochstraßen (highways on stilts), the revolutionary new main station (then the most modern station in Europe), several tower blocks and a whole new suburb, the satellite quarter Pfingstweide north of Edigheim. The city's economic wealth allowed social benefits and institutions to be introduced. The population number reached its all-time climax in 1970 with more than 180,000 inhabitants, thus surpassing even the capital of Rheinland-Pfalz, Mainz, for a while. In the early 1970s, a plan to reform the composition of the German Bundesländer, which would have created a new state around a united Mannheim-Ludwigshafen as capital with more than half a million inhabitants, failed. Nevertheless, further ambitious projects were financed in Ludwigshafen, first of all the 15-floor city hall with its linked-up shopping centre ("Rathaus Center"). The last (up to now) new incorporated suburb was Ruchheim in 1974. But then a process began that accelerated during the 1980s and 1990s and caused the financial near-collapse of Ludwigshafen. The enormous maintenance costs of the buildings and institutions introduced during the “fat time”, new tax regulations that cut down the trade tax profits from the local industries, and thousands of dismissals in BASF were the main causes for the city's crisis. Loss of population due to the loss of working places and general economic trends, such as the oil crises, further worsened Ludwigshafen's financial situation at the end of the 20th century. The negative aspects of industrial success became obvious when examinations revealed the bad state of air and the Rhine due to pollution. There had always been some stench or dirt all over the city, caused by BASF and other plants, and as long as the industry had prospered, people had accepted it. Besides that, the concrete constructions that had been so modern after the war and had a formative influence on today's cityscape were increasingly considered as obsolete.