Philadelphia is the most historic city in the United States and its position is very important.
1774- 1775 two continental conferences were held here and the declaration of independence was adopted; 1787, a constitutional convention was held here, and the first federal constitution was born.
/kloc-since the 0/9th century, railways and ports have developed rapidly, and the manufacturing industry has risen. 1860, the manufacturing output value once accounted for 30% of the country.
It remains one of the major economic, transportation and cultural centers in the United States.
1876, Philadelphia held the World Expo and the exhibition commemorating the 0/00th anniversary of American independence.
1926, the 50th anniversary of American independence exposition was held.
From 65438 to 0976, Philadelphia was also one of the cities commemorating the bicentennial of American independence.
Since 1854, Feicheng and Philadelphia County are two parallel places * * *, while since 1952, cities and counties have * * * organizations, but Philadelphia County still belongs to the next independent county in Pennsylvania.
20 15, 1 1, Philadelphia is listed as a world heritage city, and it is the first American city to be listed as a world heritage city.