Question: How many acres is the district in Selma where  the most popular style of house in the Southern United States from the end of the American Civil War (1861–65) through the 1920s be found?

Context paragraphs:
Edisto Island during the American Civil War: Edisto Island during the American Civil War was the location of a number of minor engagements and for a time of a large colony of African-American escaped former slaves during the American Civil War (1861–1865).  Edisto Island was largely abandoned by planters in November 1861 and in December 1861, escaped slaves began setting up their own refugee camps there.  In January 1862, armed African Americans from the island and Confederate forces clashed and a Confederate raid in reprisal killed a small number of unarmed African Americans.  In February, Union forces were stationed on the island to develop it as a staging area for future campaigns against Charleston, twenty-five miles away, as well as to protect the colony, which would eventually number thousands of African Americans.  As Union forces took control of the island, a number of skirmishes occurred, but Confederates withdrew.  In June, most of the Union troops left the island in a campaign, which culminated in the Battle of Secessionville.  In July, the remaining troops withdrew, and the colony was removed to St. Helena Island.  For the rest of the war, a small number of escaped slaves and plantation owners remained and farmed the island, but it was largely abandoned.  Near the end of the war, the island was again used as a location of colonies of freed slaves.

Old Town Historic District (Selma, Alabama): The Old Town Historic District is a 323 acre historic district in Selma, Dallas County, Alabama.  It is bounded by U.S. Route 80, Broad and Franklin streets, and Dallas and Selma avenues.  The boundaries were increased on December 15, 2003.  The district includes examples of the Federal, Greek Revival, Italianate, Gothic Revival, Victorian, Shotgun, Queen Anne, Romanesque Revival, Renaissance Revival, and Classical Revival.  It contains 629 properties, with 513 contributing and 116 noncontributing to the district.  It was added to the National Register of Historic Places on May 3, 1978.

Shotgun house: A "shotgun house" is a narrow rectangular domestic residence, usually no more than about 12 feet (3.5 m) wide, with rooms arranged one behind the other and doors at each end of the house.  It was the most popular style of house in the Southern United States from the end of the American Civil War (1861–65) through the 1920s.  Alternate names include "shotgun shack", "shotgun hut", "shotgun cottage", and in the case of a multihome dwelling, "shotgun apartment".  A railroad apartment is somewhat similar, but instead of each room opening onto the next room, it has a side hallway from which rooms are entered (similar to compartments in passenger rail cars).

Fort Warren (Massachusetts): Fort Warren is a historic fort on the 28 acre Georges Island at the entrance to Boston Harbor.  The fort is pentagonal star fort, made with stone and granite, and was constructed from 1833–1861, completed shortly after the beginning of the American Civil War.  Fort Warren defended the harbor in Boston, Massachusetts, from 1861 through the end of World War II, and during the Civil War served as a prison for Confederate officers and government officials.  The fort remained active through the Spanish–American War and World War I, and was re-activated during World War II.  It was permanently decommissioned in 1947, and is now a tourist site.  It was designated a National Historic Landmark in 1970 as a masterpiece of coastal engineering of the pre-Civil War period, and for its role in the Civil War.  It was named for Revolutionary war hero Dr. Joseph Warren, who sent Paul Revere on his famous ride, and was later killed at the Battle of Bunker Hill.  The name was transferred from the first Fort Warren in 1833, which was renamed Fort Winthrop.

Francis S. Bartow: Francis S. Bartow (born Francis Stebbins Bartow; September 6, 1816 – July 21, 1861) was a licensed attorney turned politician, serving two terms in the United States House of Representatives and becoming a political leader of the Confederate States of America.  Bartow was also a colonel in the Georgia Militia commanding the 21st Oglethorpe Light Infantry during the early months of the American Civil War.  Bartow was a delegate from Georgia's 1st congressional district to the Southern Convention in Montgomery, Alabama becoming an inaugurating member of the Confederate Provisional Congress—leading efforts to prepare defensive forces for an impending federal invasion which did occur, protracting into The American Civil War of 1861–65.

History of the Southern United States: The history of the Southern United States reaches back hundreds of years and includes the Mississippian people, well known for their mound building.  European history in the region began in the very earliest days of the exploration and colonization of North America.  Spain, France, and England eventually explored and claimed parts of what is now the Southern United States, and the cultural influences of each can still be seen in the region today.  In the centuries since, the history of the Southern United States has recorded a large number of important events, including the American Revolution, the American Civil War, the ending of slavery, and the American Civil Rights Movement.

Arkansas Militia in the Civil War: The units of the Arkansas Militia in the Civil War to which the current Arkansas National Guard has a connection include the Arkansas State Militia, Home Guard, and State Troop regiments raised by the State of Arkansas.  Like most of the United States, Arkansas had an organized militia system before the American Civil War (1861–65).  State law required military service of most male inhabitants of a certain age.  Following the War with Mexico (1846–48) the Arkansas militia experienced a decline, but as sectional frictions between the north and south began to build in the late 1850s the militia experienced a revival.  By 1860 the state's militia consisted of 62 regiments divided into eight brigades, which comprised an eastern division and a western division.  New regiments were added as the militia organization developed.  Additionally, many counties and cities raised uniformed volunteer companies, which drilled more often and were better equipped than the un-uniformed militia.  These volunteer companies were instrumental in the seizure of federal installations at Little Rock and Fort Smith, beginning in February 1861.

Restored Government of Virginia: The Restored Government of Virginia, also known as the Reorganized Government of Virginia, was the Unionist government of Virginia during the American Civil War (1861-1865).  From 1861 until mid-1863 it met in Wheeling along the southeast shore of the Ohio River on the extreme northwestern border of the former Commonwealth of Virginia which had seceded from the United States in April 1861 and immediately joined the newly established Confederate States of America of other Southern states.  From August 26, 1863, until June 1865, it met in Alexandria on the northeast edge of the state, on the south shore of the Potomac River across from the national capital of Washington, D.C., which had been occupied by Union Army forces since May 1861.  The Restored Government claimed Richmond as its official capital from its formation and it eventually moved there near the end of the war after the rebel Confederate States government and General-in-Chief Robert E. Lee's Army of Northern Virginia evacuated it as their capital in late March 1865, and the city shortly returned to Federal control.

Slavery by Another Name: Slavery by Another Name: The Re-Enslavement of Black Americans from the Civil War to World War II is a book by American writer Douglas A. Blackmon, published by Anchor Books in 2008.  It explores the forced labor of imprisoned black men and women, through the convict lease system used by states, local governments, white farmers, and corporations after the American Civil War until World War II in the southern United States.  Blackmon argues that slavery in the United States did not end with the Civil War, but instead persisted well into the 20th century.  It depicts the subjugation of Convict Leasing, Sharecropping and Peonage and tells the fate of the former but not of the latter two.

Battle of Sewell's Point: The Battle of Sewell's Point was an inconclusive exchange of cannon fire between the Union gunboat USS "Monticello", supported by the USS "Thomas Freeborn", and Confederate batteries on Sewell's Point that took place on May 18, 19 and 21, 1861, in Norfolk County, Virginia in the early days of the American Civil War.  Little damage was done to either side.  By the end of April 1861, USS "Cumberland" and a small number of supporting ships were enforcing the Union blockade of the southeastern Virginia ports at the southern end of the Chesapeake Bay and had captured several ships which attempted to pass the blockade.  USS "Monticello's" bombardment of the Sewell's Point battery was one of the earliest Union Navy actions against Confederate forces during the Civil War.  While it has been suggested by some sources that the "Monticello's" action may have been the first gunfire by the Union Navy during the Civil War, a brief exchange of cannon fire between the U.S. gunboat USS "Yankee" and shore batteries manned by Virginia volunteer forces which had not yet been incorporated into the Confederate States Army at Gloucester Point, Virginia on the York River occurred on May 7, 1861.

Supporting paragraphs: Old Town Historic District (Selma, Alabama) Shotgun house
Answer: 323