Plovdiv reached an agreement that the Principality of Bulgaria and Eastern Rumelia had a common government, Parliament, administration, and army. Today 6 September is celebrated as the Unification Day and the Day of Plovdiv. After the unification, Plovdiv remained the second most populous city in Bulgaria after the capital Sofia. The first railway in the city was built in 1874 connecting it with the Ottoman capital, and in 1888, it was linked with Sofia. In 1892 Plovdiv became host of the First Bulgarian Fair with international participation which was succeeded by the International Fair Plovdiv. After the liberation, the first brewery
Plovdiv the Kapitan Raycho Street, Forum in Trakiya, Excelsior, and others. Plovdiv has three large shopping centers: the €40 million Mall of Plovdiv (opened 2009) with a shopping area of , 11 cinema halls, and parking for 700 cars; Markovo tepe Mall (opened 2016); and Galeria Mall which is 6 stories high with 127 000 m area, half of which is the parking lot and the rest is shopping area. Due to high demand for business office space, new office and commercial buildings have been built. Several hypermarkets have been built mainly on the outskirts of the city: Metro, Kaufland, Triumf,