After the inauguration of Washington as President of the new republic, it was determined by Congress that Philadelphia should be the seat of the United States government for the ensuing ten years, after which it should be removed to Washington City. The scheme of the Federal Constitution was framed and adopted in September, 1787, by the Convention sitting at the State House, with George Washington as President. The final adoption of the Constitution of the United States of America was celebrated in Philadelphia on the Fourth of July, 1788 by a magnificent procession.

The principal officers of Congress removed their residences to Philadelphia in the latter part of 1790. At that period Washington lived in Market street near Sixth, in a plain two-story brick house, which had been the residence of Lord Howe during the British occupation of the city. The locality is now occupied, if I mistake not, by the mammoth clothing house of Wanamaker & Brown. John Adams, Vice-President, lived in the Hamilton mansion at Bush Hill; and Thomas Jefferson, Secretary of State, at 174 Market street, between Fourth and Fifth, on the south side. Congress assembled for the transaction of business on State House Square.

During the stay of the Federal government in Philadelphia, Washington and Adams were inaugurated as President and Vice President (March fourth, 1797), in the chamber of the House of Representatives.

In 1793, 1797, and 1798, a fearful epidemic of the yellow fever, visited Philadelphia and created great alarm, the mortality being dreadful.

The removal of the Federal government to Washington, in 1800, deprived Philadelphia of the prominence she had enjoyed as the Capital of the nation. In the year 1808 steamboats began to ply regularly on the Delaware River. During the war which commenced in 1812 between the United States and Great Britain, Philadelphia maintained her loyalty, and fulfilled her duty to the country. Several volunteer companies were formed, and there was an engagement in July, 1813, between British war vessels and the United States gunboat flotilla on the Delaware, in which the Philadelphians proved themselves brave and patriotic.

The first railroad, running from Philadelphia to Germantown, was built in 1832. The Pennsylvania Railroad was projected in 1845, and chartered in the following year.

In 1834 a spirit of riot and disorder which passed over the United States, reached Philadelphia, and led to disturbances between whites and blacks. The houses of colored people were broken into, a meeting-house torn down, and many other outrages committed. Again, in 1835 attacks were made on the blacks, and houses burned. In 1838 all friends of the abolition of slavery were violently attacked, and much damage done to property in the city.

But the most terrible riots which Philadelphia has known occurred in 1844. A meeting of the Native American party was attacked and dispersed. The "Natives" rallied to a market house on Washington street, where they were again attacked, and fire-arms used on both sides. Houses were broken into and set on fire. The Roman Catholic churches of Saint Michael and Saint Augustine, and a female Catholic seminary, were burned, and many buildings sacked and destroyed. All the Catholic churches were in great danger of sharing the same fate. A large number of persons were killed on both sides. On July fourth, of the same year, the Native Americans had a very large and showy procession through the streets of the city. On Sunday, July seventh, the church of Saint Philip de Neri, in Southwark, was broken into by the mob. In clearing the streets, the soldiers and the people came into collision. The former fired into the crowd, and several persons were killed, and others wounded. This occurrence caused intense excitement. The soldiers were attacked with cannon and with musketry, and they responded with artillery and with musketry. The rioters had four pieces, which were worked by sailors. The battle continued during the night of the seventh and the morning of the eighth of July. Two soldiers were killed, and several wounded. Of the citizens seven were killed, and many wounded. This was the most sanguinary riot, and the last of any importance, which ever occurred in Philadelphia.

Philadelphia possesses many characteristic features which distinguish her from her sister cities. The visitor will be at first struck by the extreme regularity of the streets, and the look of primness which invests them. They are laid out at right angles, the only notable exceptions being those roads, now dignified by the name of avenues, which usually led from the infant city into the then adjacent country. These avenues, of which Passyunk, Germantown and Ridge are the principal ones, are irregular in their course, but take a generally diagonal direction; the first southwest, and the other two northwest. The houses are mostly of brick, with white marble facings and steps, and white wooden shutters to the first story. The streets running east and west, from the Delaware to the Schuylkill, are, in the original city, with few exceptions named after trees. Thus Cedar, Pine, Spruce, Locust, Walnut, Chestnut, Filbert, Mulberry, Cherry, Sassafras and Vine. Cedar became South street, and Sassafras and Mulberry became Race and Arch, the latter so named because in the early days of the city Front street spanned it by an arch. Callowhill street was originally Gallowhill street, the word indicating its derivation. The houses on these streets are numbered from the Delaware, beginning a new hundred with every street. Thus all houses between Front and Second streets are numbered in the first hundred, and at Second street a new hundred begins; the even numbers being on the southern side, and the odd ones on the northern side of the street. The streets running parallel to the river are numbered from the river, beginning with Front, then Second, Third, and so on, until the furthest western limit of the city is reached. Market street, originally called High street, runs between Chestnut and Filbert, dividing the city into north and south. The houses on the streets crossing Market begin their numbers at that street, running both north and south, each street representing an additional hundred. With this naming of streets and numbering of houses, no stranger can ever lose himself in Philadelphia. The name and number of street and house will always tell him just where he is. Thus if he finds himself at 836 North Sixth street, he knows he is eight squares north of Market street, and six squares west of the Delaware River.

The original city was bounded by the Delaware River on the east, and the Schuylkill on the west, and extended north and south half a mile on either side of Market street. Even before the present century it had outgrown its original limits in a northerly and southerly direction, and a number of suburbs had sprung up around it, each of which had its own corporation. The names of these suburbs were, most of them, borrowed from London. Southwark faced the river to the south; Moyamensing was just west of Southwark; Spring Garden, Kensington, Northern Liberties, Germantown, Roxborough, and Frankford were on the north, and West Philadelphia west of the Schuylkill. In 1854 these suburbs, so long divided from the "city" merely by geographical lines, were incorporated with it; and the City of Philadelphia was made to embrace the entire county of Philadelphia—a territory twenty-three miles long, with an area of nearly one hundred and thirty square miles. It thus became in size the largest city in the country, while it stands only second in population.