Question: At the start of the 20th Century, how many square kilometers was the city in Virginia where the Civil War was fought?

full_context: Document 1: Raid on Richmond: Prior to the beginning of the raid, Thomas Jefferson, the then - Governor of Virginia, had moved the capital of Virginia from Williamsburg to Richmond, because of its strategically central, defensible location. In the event of an attack, Jefferson moved all of the town's military supplies to a foundry five miles outside of Richmond. Little did Jefferson know how big of an attack would soon follow.
Document 2: Richmond, Virginia: Richmond is home to several notable instances of various styles of modernism. Minoru Yamasaki designed the Federal Reserve Building which dominates the downtown skyline. The architectural firm of Skidmore, Owings & Merrill has designed two buildings: the Library of Virginia and the General Assembly Offices at the Eighth and Main Building. Philip Johnson designed the WRVA Building. The Richard Neutra-designed Rice House, a residence on a private island on the James River, remains Richmond's only true International Style home. The W.G. Harris residence in Richmond was designed by famed early modern architect and member of the Harvard Five, Landis Gores. Other notable architects to have worked in the city include Rick Mather, I.M. Pei, and Gordon Bunshaft.
Document 3: First Battle of Bull Run: Just months after the start of the war at Fort Sumter, the Northern public clamored for a march against the Confederate capital of Richmond, Virginia, which was expected to bring an early end to the rebellion. Yielding to political pressure, Brig. Gen. Irvin McDowell led his unseasoned Union Army across Bull Run against the equally inexperienced Confederate Army of Brig. Gen. P.G.T. Beauregard camped near Manassas Junction. McDowell's ambitious plan for a surprise flank attack on the Confederate left was poorly executed by his officers and men; nevertheless, the Confederates, who had been planning to attack the Union left flank, found themselves at an initial disadvantage.
Document 4: Richmond, Virginia: Richmond's economy is primarily driven by law, finance, and government, with federal, state, and local governmental agencies, as well as notable legal and banking firms, located in the downtown area. The city is home to both the United States Court of Appeals for the Fourth Circuit, one of 13 United States courts of appeals, and the Federal Reserve Bank of Richmond, one of 12 Federal Reserve Banks. Dominion Resources and MeadWestvaco, Fortune 500 companies, are headquartered in the city, with others in the metropolitan area.
Document 5: Richmond, Virginia: Richmond emerged a decade after the smoldering rubble of the Civil War to resume its position as an economic powerhouse, with iron front buildings and massive brick factories. Canal traffic peaked in the 1860s and slowly gave way to railroads, allowing Richmond to become a major railroad crossroads, eventually including the site of the world's first triple railroad crossing. Tobacco warehousing and processing continued to play a role, boosted by the world's first cigarette-rolling machine, invented by James Albert Bonsack of Roanoke in 1880/81. Contributing to Richmond's resurgence was the first successful electrically powered trolley system in the United States, the Richmond Union Passenger Railway. Designed by electric power pioneer Frank J. Sprague, the trolley system opened its first line in 1888, and electric streetcar lines rapidly spread to other cities across the country. Sprague's system used an overhead wire and trolley pole to collect current, with electric motors on the car's trucks. In Richmond, the transition from streetcars to buses began in May 1947 and was completed on November 25, 1949.
Document 6: Richmond, Virginia: During the late 1980s and early 1990s, Richmond experienced a spike in overall crime, in particular, the city's murder rate. The city had 93 murders for the year of 1985, with a murder rate of 41.9 killings committed per 100,000 residents. Over the next decade, the city saw a major increase in total homicides. In 1990 there were 114 murders, for a murder rate of 56.1 killings per 100,000 residents. There were 120 murders in 1995, resulting in a murder rate of 59.1 killings per 100,000 residents, one of the highest in the United States.
Document 7: Richmond, Virginia: In 1990 religion and politics intersected to impact the outcome of the Eighth District election in South Richmond. With the endorsements of black power brokers, black clergy and the Richmond Crusade for Voters, South Richmond residents made history, electing Reverend A. Carl Prince to the Richmond City Council. As the first African American Baptist Minister elected to the Richmond City Council, Prince's election paved the way for a political paradigm shift in politics that persist today. Following Prince's election, Reverend Gwendolyn Hedgepeth and the Reverend Leonidas Young, former Richmond Mayor were elected to public office. Prior to Prince's election black clergy made political endorsements and served as appointees to the Richmond School Board and other boards throughout the city. Today religion and politics continues to thrive in the Commonwealth of Virginia. The Honorable Dwight C. Jones, a prominent Baptist pastor and former Chairman of the Richmond School Board and Member of the Virginia House of Delegates serves as Mayor of the City of Richmond.
Document 8: Virginia in the American Civil War: Most of the battles in the Eastern Theater of the American Civil War took place in Virginia because the Confederacy had to defend its national capital at Richmond, and public opinion in the North demanded that the Union move ``On to Richmond! ''The successes of Robert E. Lee in defending Richmond are a central theme of the military history of the war. The White House of the Confederacy, located a few blocks north of the State Capitol, was home to the family of Confederate leader Jefferson Davis.
Document 9: Army of Northern Virginia: The Army of Northern Virginia was the primary military force of the Confederate States of America in the Eastern Theater of the American Civil War. It was also the primary command structure of the Department of Northern Virginia. It was most often arrayed against the Union Army of the Potomac.
Document 10: Richmond, Virginia: Law and finance have long been driving forces in the economy. The city is home to both the United States Court of Appeals for the Fourth Circuit, one of 13 United States courts of appeals, and the Federal Reserve Bank of Richmond, one of 12 Federal Reserve Banks, as well as offices for international companies such as Genworth Financial, CapitalOne, Philip Morris USA, and numerous other banks and brokerages. Richmond is also home to four of the largest law firms in the United States: Hunton & Williams, McGuireWoods, Williams Mullen, and LeClairRyan. Another law firm with a major Richmond presence is Troutman Sanders, which merged with Richmond-based Mays & Valentine LLP in 2001.
Document 11: Charleston, South Carolina: In 1875, blacks made up 57% of the city's population, and 73% of Charleston County. With leadership by members of the antebellum free black community, historian Melinda Meeks Hennessy described the community as "unique" in being able to defend themselves without provoking "massive white retaliation", as occurred in numerous other areas during Reconstruction. In the 1876 election cycle, two major riots between black Republicans and white Democrats occurred in the city, in September and the day after the election in November, as well as a violent incident in Cainhoy at an October joint discussion meeting.
Document 12: Richmond, Virginia: On 17 April 1861, five days after the Confederate attack on Fort Sumter, the legislature voted to secede from the United States and joined the Confederacy. Official action came in May, after the Confederacy promised to move its national capital to Richmond. The city was at the end of a long supply line, which made it somewhat difficult to defend, although supplies continued to reach the city by canal and wagon for years, since it was protected by the Army of Northern Virginia and arguably the Confederacy's best troops and commanders. It became the main target of Union armies, especially in the campaigns of 1862 and 1864-5.
Document 13: Richmond, Virginia: The site of Richmond had been an important village of the Powhatan Confederacy, and was briefly settled by English colonists from Jamestown in 1609, and in 1610–1611. The present city of Richmond was founded in 1737. It became the capital of the Colony and Dominion of Virginia in 1780. During the Revolutionary War period, several notable events occurred in the city, including Patrick Henry's "Give me liberty or give me death" speech in 1775 at St. John's Church, and the passage of the Virginia Statute for Religious Freedom written by Thomas Jefferson. During the American Civil War, Richmond served as the capital of the Confederate States of America. The city entered the 20th century with one of the world's first successful electric streetcar systems, as well as a national hub of African-American commerce and culture, the Jackson Ward neighborhood.
Document 14: Richmond, Virginia: As the primary former Capital of the Confederate States of America, Richmond is home to many museums and battlefields of the American Civil War. Near the riverfront is the Richmond National Battlefield Park Visitors Center and the American Civil War Center at Historic Tredegar, both housed in the former buildings of the Tredegar Iron Works, where much of the ordnance for the war was produced. In Court End, near the Virginia State Capitol, is the Museum of the Confederacy, along with the Davis Mansion, also known as the White House of the Confederacy; both feature a wide variety of objects and material from the era. The temporary home of former Confederate General Robert E. Lee still stands on Franklin Street in downtown Richmond. The history of slavery and emancipation are also increasingly represented: there is a former slave trail along the river that leads to Ancarrow's Boat Ramp and Historic Site which has been developed with interpretive signage, and in 2007, the Reconciliation Statue was placed in Shockoe Bottom, with parallel statues placed in Liverpool and Benin representing points of the Triangle Trade.
Document 15: Richmond, Virginia: By the beginning of the 20th century, the city's population had reached 85,050 in 5 square miles (13 km2), making it the most densely populated city in the Southern United States. In 1900, the Census Bureau reported Richmond's population as 62.1% white and 37.9% black. Freed slaves and their descendants created a thriving African-American business community, and the city's historic Jackson Ward became known as the "Wall Street of Black America." In 1903, African-American businesswoman and financier Maggie L. Walker chartered St. Luke Penny Savings Bank, and served as its first president, as well as the first female bank president in the United States. Today, the bank is called the Consolidated Bank and Trust Company, and it is the oldest surviving African-American bank in the U.S. Other figures from this time included John Mitchell, Jr. In 1910, the former city of Manchester was consolidated with the city of Richmond, and in 1914, the city annexed Barton Heights, Ginter Park, and Highland Park areas of Henrico County. In May 1914, Richmond became the headquarters of the Fifth District of the Federal Reserve Bank.
ground_truth: 13
sub_queries: where was the civil war fought in virginia Answer: Richmond
How many square kilometers was Richmond at the start of the 20th century? Answer: 13