Question: What county has the National Historic Site for the person who was president when the state that contains Downtown Anchorage was purchased?

full_context: Document 1: Greeneville, Tennessee: Greeneville is a town in, and the county seat of Greene County, Tennessee, United States. The population as of the 2010 census was 15,062. The town was named in honor of Revolutionary War hero Nathanael Greene. It is the only town with this spelling in the United States, although there are numerous U.S. towns named "Greenville". The town was the capital of the short-lived State of Franklin in the 18th-century history of the Tennessee region.
Document 2: Alaska Purchase: Russia continued to see an opportunity to weaken British power by causing British Columbia, including the Royal Navy base at Esquimalt, to be surrounded or annexed by American territory. Following the Union victory in the Civil War, the Tsar instructed the Russian minister to the United States, Eduard de Stoeckl, to re-enter into negotiations with William H. Seward in the beginning of March 1867. President Johnson was entangled in negotiations about Reconstruction and Seward had alienated a number of Republicans, so they believed that the purchase would help divert attention from the domestic issues. The negotiations concluded after an all - night session with the signing of the treaty at 04: 00 on March 30, 1867, with the purchase price set at $7.2 million ($105 million in 2016), or about 2 cents per acre ($4.74 / km).
Document 3: Alaska Purchase: Russia continued to see an opportunity to weaken British power by causing British Columbia, including the Royal Navy base at Esquimalt, to be surrounded or annexed by American territory. Following the Union victory in the civil war, the Tsar instructed the Russian minister to the United States, Eduard de Stoeckl, to re-enter into negotiations with William Seward in the beginning of March 1867. President Johnson was entangled in negotiations about Reconstruction and Seward had alienated a number of Republicans, so they believed that the purchase would help divert attention from the current domestic matters. The negotiations concluded after an all - night session with the signing of the treaty at 04: 00 on March 30, 1867, with the purchase price set at $7.2 million ($123 million today), or about 2 cents per acre ($4.74 / km).
Document 4: Andrew Johnson National Historic Site: The cemetery also includes the interments of Johnson's wife, Eliza McCardle Johnson, and son Brigadier General Robert Johnson Henderson. David T. Patterson, a United States Senator from Tennessee, and his son Andrew J. Patterson, who was instrumental in securing historic designation for the Greeneville properties associated with Andrew Johnson, were among others buried in the cemetery. The site was authorized by Congress as a U.S. National Monument in 1935, established on April 27, 1942, and redesignated a National Historic Site on December 11, 1963.
Document 5: Alaska: The Alaska Bush, central Juneau, midtown and downtown Anchorage, and the areas surrounding the University of Alaska Fairbanks campus and Ester have been strongholds of the Democratic Party. The Matanuska-Susitna Borough, the majority of Fairbanks (including North Pole and the military base), and South Anchorage typically have the strongest Republican showing. As of 2004[update], well over half of all registered voters have chosen "Non-Partisan" or "Undeclared" as their affiliation, despite recent attempts to close primaries to unaffiliated voters.
Document 6: Houston: The Theater District is a 17-block area in the center of downtown Houston that is home to the Bayou Place entertainment complex, restaurants, movies, plazas, and parks. Bayou Place is a large multilevel building containing full-service restaurants, bars, live music, billiards, and Sundance Cinema. The Bayou Music Center stages live concerts, stage plays, and stand-up comedy. Space Center Houston is the official visitors' center of NASA's Lyndon B. Johnson Space Center. The Space Center has many interactive exhibits including moon rocks, a shuttle simulator, and presentations about the history of NASA's manned space flight program. Other tourist attractions include the Galleria (Texas's largest shopping mall, located in the Uptown District), Old Market Square, the Downtown Aquarium, and Sam Houston Race Park.
Document 7: New Haven, Connecticut: Grove Street Cemetery, a National Historic Landmark which lies adjacent to Yale's campus, contains the graves of Roger Sherman, Eli Whitney, Noah Webster, Josiah Willard Gibbs, Charles Goodyear and Walter Camp, among other notable burials. The cemetery is known for its grand Egyptian Revival gateway. The Union League Club of New Haven building, located on Chapel Street, is notable for not only being a historic Beaux-Arts building, but also is built on the site where Roger Sherman's home once stood; George Washington is known to have stayed at the Sherman residence while President in 1789 (one of three times Washington visited New Haven throughout his lifetime).
Document 8: Tennessee: The modern spelling, Tennessee, is attributed to James Glen, the governor of South Carolina, who used this spelling in his official correspondence during the 1750s. The spelling was popularized by the publication of Henry Timberlake's "Draught of the Cherokee Country" in 1765. In 1788, North Carolina created "Tennessee County", the third county to be established in what is now Middle Tennessee. (Tennessee County was the predecessor to current-day Montgomery County and Robertson County.) When a constitutional convention met in 1796 to organize a new state out of the Southwest Territory, it adopted "Tennessee" as the name of the state.
Document 9: Tennessee: In 1864, Andrew Johnson (a War Democrat from Tennessee) was elected Vice President under Abraham Lincoln. He became President after Lincoln's assassination in 1865. Under Johnson's lenient re-admission policy, Tennessee was the first of the seceding states to have its elected members readmitted to the U.S. Congress, on July 24, 1866. Because Tennessee had ratified the Fourteenth Amendment, it was the only one of the formerly secessionist states that did not have a military governor during the Reconstruction period.
Document 10: Alaska Purchase: The Alaska Purchase (Russian: Продажа Аляски, tr. Prodazha Alyaski) was the United States' acquisition of Alaska from the Russian Empire on March 30, 1867, by a treaty ratified by the United States Senate, and signed by president Andrew Johnson.
Document 11: Downtown Anchorage: Downtown Anchorage is a neighborhood in the U.S. city of Anchorage, Alaska. Considered the central business district of Anchorage, Downtown has many office buildings, cultural points of interest, shopping areas, as well as dining and nightlife attractions. Today's Downtown was the original site of the Anchorage Land Auction in 1915, which gave rise to today's present-day grid street pattern. The actual original townsite was a tent city located off the banks of Ship Creek, at present-day Government Hill.
Document 12: Nashville, Tennessee: The town of Nashville was founded by James Robertson, John Donelson, and a party of Overmountain Men in 1779, near the original Cumberland settlement of Fort Nashborough. It was named for Francis Nash, the American Revolutionary War hero. Nashville quickly grew because of its strategic location, accessibility as a port on the Cumberland River, a tributary of the Ohio River; and its later status as a major railroad center. By 1800, the city had 345 residents, including 136 African American slaves and 14 free blacks. In 1806, Nashville was incorporated as a city and became the county seat of Davidson County, Tennessee. In 1843, the city was named the permanent capital of the state of Tennessee.
Document 13: Ann Arbor, Michigan: The Kerrytown Shops, Main Street Business District, the State Street Business District, and the South University Business District are commercial areas in downtown Ann Arbor. Three commercial areas south of downtown include the areas near I-94 and Ann Arbor-Saline Road, Briarwood Mall, and the South Industrial area. Other commercial areas include the Arborland/Washtenaw Avenue and Packard Road merchants on the east side, the Plymouth Road area in the northeast, and the Westgate/West Stadium areas on the west side. Downtown contains a mix of 19th- and early-20th-century structures and modern-style buildings, as well as a farmers' market in the Kerrytown district. The city's commercial districts are composed mostly of two- to four-story structures, although downtown and the area near Briarwood Mall contain a small number of high-rise buildings.
Document 14: Alaska Purchase: The Alaska Purchase (Russian: Продажа Аляски, tr. Prodazha Alyaski) was the United States' acquisition of Alaska from the Russian Empire on March 30, 1867, by a treaty ratified by the United States Senate, and signed by President Andrew Johnson.
Document 15: Andrew Johnson National Cemetery: The Andrew Johnson National Cemetery is a United States National Cemetery on the grounds of the Andrew Johnson National Historic Site in Greeneville, Tennessee. Established in 1906, the cemetery was built around the resting place of Andrew Johnson, the 17th President of the United States, and holds more than two thousand graves.
ground_truth: Greene County
sub_queries: What is the name of the state where Downtown Anchorage is located? Answer: Alaska
who was the president when Alaska was purchased Answer: Andrew Johnson
Andrew Johnson National Historic Site >> located in the administrative territorial entity Answer: Greeneville
Greeneville >> located in the administrative territorial entity Answer: Greene County