Question: When did the place where Seacow Head Light is located become a province?

full_context: Document 1: Cape Hatteras Lighthouse: In 1999, with the sea again encroaching, the Cape Hatteras lighthouse had to be moved from its original location at the edge of the ocean to safer ground 2,900 feet (880 m) inland, and 1,500 feet (460 m) from the shoreline. Due to erosion of the shore, the lighthouse was just 15 feet (4.6 m) from the ocean's edge and was in imminent danger. International Chimney Corp. of Buffalo, New York was awarded the contract to move the lighthouse, assisted, among other contractors, by Expert House Movers. The move was controversial at the time with speculation that the structure would not survive the move, resulting in lawsuits that were later dismissed. Despite some opposition, work progressed and the move was completed on September 14, 1999.
Document 2: Prince Edward Island: Prince Edward Island (PEI or P.E.I.; French: Île - du - Prince - Édouard) is a province of Canada consisting of the island of the same name, and several much smaller islands. Prince Edward Island is one of the three Maritime Provinces and is the smallest province in both land area and population. It is part of the traditional lands of the Mi'kmaq, and became a British colony in the 1700s and was federated into Canada as a province in 1873. Its capital is Charlottetown. According to the 2016 census, the province of Prince Edward Island has 142,907 residents.
Document 3: Seacow Head Light: The Seacow Head Light is a lighthouse on the south-central coast of Prince Edward Island, Canada, west of Central Bedeque. It was built in 1864. The lighthouse was relocated in 1979 to avoid erosion. The lighthouse appeared in several episodes of the television series "Road to Avonlea" and was home to one of the series' main characters, Gus Pike.
Document 4: Lennox Island (Prince Edward Island): Lennox Island is an island located in Malpeque Bay off the northwest coast of Prince Edward Island, Canada. Connected by a short causeway and bridge, Lennox Island is home to the Lennox Island First Nation, of the Mi'kmaq people. The Mi'kmaq name for the island was "L'nui Minegoo", and it has been informally known by European settlers as "Indian Island".
Document 5: Province House (Prince Edward Island): Province House is where the Prince Edward Island Legislature, known as the Legislative Assembly of Prince Edward Island, has met since 1847. The building is located at the intersection of Richmond and Great George Streets in Charlottetown; it is Canada's second-oldest seat of government.
Document 6: Geography of Prince Edward Island: Prince Edward Island's geography is mostly pastoral with red soil, white sand, and scattered communities. Known as the "Garden of the Gulf", the island is located in the Gulf of Saint Lawrence north of Nova Scotia and east of New Brunswick, with which it forms the Northumberland Strait.
Document 7: Malpeque Outer Range Lights: The Malpeque Outer Range Lights are a set of range lights on Prince Edward Island, Canada. They were built in 1922, and are still active.
Document 8: Pictou Island (Nova Scotia): Pictou Island is a Canadian island located in the Northumberland Strait approximately 4 NM north of Nova Scotia and 10 NM south of Prince Edward Island. Measuring 9.5 km in length and 2.5 km in width, the total area is 23.75 km. The island is administratively part of Pictou County. The island's highest elevation is 24 meters (78 feet) above sea level, and its current full-time residents population (as of 2016) stands at 28, with the seasonal population rising and lowering.
Document 9: Pointe-au-Père Lighthouse: The 3rd Pointe-Au-Père lighthouse was built in 1909 in the city of Pointe-au-Père, near Rimouski, Quebec, Canada. This city was well known in naval circles as the location of the pilot station for the Bas-Saint-Laurent (lower St. Lawrence) zone. Pointe-au-Père has since been amalgamated into the larger city of Rimouski (2002).
Document 10: Norah Head Light: Norah Head Light is an active lighthouse located at Norah Head, a headland on the Central Coast, New South Wales, Australia, close to Toukley. It is the last lighthouse of the James Barnet style to be built, and the last staffed lighthouse constructed in New South Wales.
Document 11: North Cape Light: The North Cape Light is an active lighthouse on Prince Edward Island, Canada. It was built in 1867, and is still active.
Document 12: Prince Edward Island: Prince Edward Island Île - du - Prince - Édouard (French) Epekwitk (Mi'kmaq) Flag Coat of arms Motto (s): Latin: Parva sub ingenti (The small protected by the great) BC AB SK MB ON QC NB PE NS NL YT NT NU Confederation July 1, 1873 (8th) Capital Charlottetown Largest city Charlottetown Largest metro Charlottetown Government Lieutenant Governor Antoinette Perry Premier Wade MacLauchlan (Liberal) Legislature Legislative Assembly of Prince Edward Island Federal representation (in Canadian Parliament) House seats 4 of 338 (1.2%) Senate seats 4 of 105 (3.8%) Area Total 5,660 km (2,190 sq mi) Land 5,660 km (2,190 sq mi) Water 0 km (0 sq mi) 0% Area rank Ranked 13th 0.1% of Canada Population (2016) Total 142,907 Estimate (2018 Q1) 152,768 Rank Ranked 10th Density 25.25 / km (65.4 / sq mi) Demonym (s) Prince Edward Islander, Islander Official languages English (de facto) GDP Rank 10th Total (2011) C $5.353 billion Per capita C $36,740 (13th) Time zone Atlantic: UTC - 4 Postal abbr. PE Postal code prefix ISO 3166 code CA - PE Flower Pink lady's slipper Tree Red oak Bird Blue jay Website www.princeedwardisland.ca Rankings include all provinces and territories
Document 13: Crookhaven Heads Light: Crookhaven Heads Light is an active lighthouse located at Crookhaven Heads, a headland on the south side of the entrance to the Shoalhaven River, north of Culburra Beach, New South Wales, Australia. Together with a movable light flashing yellow every 2s it serves as a range light into the channel. The lighthouse is in a severely deteriorated condition, and considered by some the most endangered lighthouse in New South Wales, suffering from repeated vandalization.
Document 14: Churchill, Prince Edward Island: Churchill is a community in the Canadian province of Prince Edward Island. The community was named for Winston Churchill. It is located in the township of Lot 65, Queens County immediately west of New Haven.
Document 15: Charlottetown (electoral district): Charlottetown (formerly Hillsborough) is a federal electoral district in Prince Edward Island, Canada, that has been represented in the House of Commons of Canada since 2004. The district, which includes the entire City of Charlottetown, has an area of 46 km and a population of 34,562 as of 2011.
ground_truth: 1873
sub_queries: Seacow Head Light >> located in the administrative territorial entity Answer: Prince Edward Island
when did Prince Edward Island become a province Answer: 1873