Question: When did the British museum start expanding its collections?
About the article "British Museum", section "Collecting from the wider world (1850–75)".

Candidate passages:
  The British Museum, London  
The British Museum is a museum in London dedicated to human history and culture.
Its permanent collection, numbering some 8 million works, is among the largest and most comprehensive in existence and originates from all continents, illustrating and documenting the story of human culture from its beginnings to the present.
The British Museum was established in 1753, largely based on the collections of the physician and scientist Sir Hans Sloane.
The museum first opened to the public on 15 January 1759 in Montagu House in Bloomsbury, on the site of the current museum building.
Its expansion over the following two and a half centuries was largely a result of an expanding British colonial footprint and has resulted in the creation of several branch institutions, the first being the British Museum (Natural History) in South Kensington in 1887.
Some objects in the collection, most notably the Elgin Marbles from the Parthenon, are the objects of controversy and of calls for restitution to their countries of origin.
Until 1997, when the British Library (previously centred on the Round Reading Room) moved to a new site, the British Museum housed both a national museum of antiquities and a national library in the same building.
The museum is a non-departmental public body sponsored by the Department for Culture, Media and Sport, and as with all other national museums in the United Kingdom it charges no admission fee, except for loan exhibitions.
Since 2002 the director of the museum has been Neil MacGregor. 
The Musée Bonnat-Helleu is an art museum in Bayonne, Aquitaine, France.
The museum was created in 1901 when Bayonne-born painter Léon Bonnat gave his extensive personal collections of art – notably an exceptional drawing collection – as well as many of his paintings to the City of Bayonne.
Subsequent donors enriched the collections of the Bonnat Museum with major gifts in 1936, 1988, 1992 and 2009-2010, making its holdings one of the largest collections of art in southern France.
The museum holds more than 6500 works of art including one of the most important collections of Spanish and British painting in France, a collection of 19th-century French painting and one of the finest drawing cabinet in the country after that of the Louvre. 
ACM did not have a permanent collection until the late 1970s.
The museum was not allowed to build such a collection by the Smithsonian.
The Smithsonian lacked in its collections related to African American history and culture, and John Kinard help encourage other museums to start acquiring objects, such as artwork and pieces owned by Duke Ellington.
In 1977 the museum was able to start building its permanent collection.
It wasn't until 1992 that ACM created its first collections management policy, specifying a focus on the Anacostia neighborhood and surrounding areas.
The museum was donated the archives of Lorenzo Dow Turner, in 2003, by his wife, Lois Turner Williams.
In 2010, an exhibition "Word, Shout, Song: Lorenzo Dow Turner, Connecting Communities Through Language," was held to showcase the collection.
The museum also has a collection of art including artists such as James A. Porter, Sam Gilliam, and Benny Andrews. 
The workmen who discovered the hoard sold items to a man they knew as "Stoney Jack", the antiques dealer and pawnshop owner George Fabian Lawrence, who frequently paid labourers cash for interesting finds from London building sites.
He was appointed by Guildhall Museum to seek out new items for its collection and became Inspector of Excavations for the nascent London Museum in 1911.
The Goldsmiths' Company did not assert their ownership of the finds, and no treasure trove inquest was held.
Lewis Vernon Harcourt, 1st Viscount Harcourt provided the funds for the London Museum to purchase most of the Cheapside Hoard, though a few pieces went to the British Museum and the Guildhall Museum, and one gold and enamel chain was purchased by the Victoria and Albert Museum.
The finds were exhibited at the London Museum in Kensington in 1914, to great acclaim.
The collections of the Guildhall Museum and the London Museum came together when they merged to form the Museum of London in 1975.
The entire hoard was displayed together for the first time in more than 100 years at the Museum of London, from October 2013 to April 2014.