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
Economy of Plovdiv which employs 300 high-qualified personnel. Another significant factory is Saninelli which produces cloth and has 1,400 employees. Plovdiv is the seat of one of the oldest breweries in the country, Kamenitza, founded in 1881. Currently Kamenitza is the leading national beer company with market share of 18%. The brewery is situated in the Eastern district and employs 650 workers. Due to the growing demand for business office space Business Park Plovdiv is going to be constructed in the district of Trakiya. The investment is for €68,000,000 and the future park will occupy a built area of 110,000 m². A commercial