Photographs: Herwig Prammer/Reuters
There are many countries that have restrictive immigration policies, while some have a welcoming policy.
Here we take a look at some countries that have given most citizenships between 2001 and 2010 in the world, according to an Organisation of Economic Co-operation and Development report.
Source: The Economist
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15 countries that lead in giving citizenship
Image: A view of the downtown area in Los Angeles.Photographs: Mario Anzuoni/Reuters
The United States
Naturalisations (2001-2010): 6.6 million
Foreign-born population of total (2010): 13 per cent
Global rank: 1
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15 countries that lead in giving citizenship
Image: A view of Moscow's Kremlin, Ministry of Foreign Affairs and Moscow City Business District.Photographs: Anton Golubev/Reuters
Russia
Naturalisations (2001-2010): 3.1 million
Foreign-born population of total (2010): N/A
Global rank: 2
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15 countries that lead in giving citizenship
Image: People play volleyball on the front lawn of Parliament Hill in Ottawa.Photographs: Chris Wattie/Reuters
Canada
Naturalisations (2001-2010): 1.7 million
Foreign-born population of total (2010): 20 per cent
Global rank: 3
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15 countries that lead in giving citizenship
Image: Traffic on the road and the Thames passes the Houses of Parliament in London.Photographs: Suzanne Plunkett/Reuters
Britain
Naturalisations (2001-2010): 1.5 million
Foreign-born population of total (2010): 12 per cent
Global rank: 4
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15 countries that lead in giving citizenship
Image: View of rooftops and the Montmartre's Sacre Coeur Basilica in Paris.Photographs: Mal Langsdon/Reuters
France
Naturalisations (2001-2010): 1.4 million
Foreign-born population of total (2010): 9 per cent
Global rank: 5
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15 countries that lead in giving citizenship
Image: The skyline of Frankfurt with its bank towers is seen under clouds.Photographs: Kai Pfaffenbach/Reuters
Germany
Naturalisations (2001-2010): 1.3 million
Foreign-born population of total (2010): 13 per cent
Global rank: 6
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15 countries that lead in giving citizenship
Image: Rowers train at dawn on the Yarra River in Melbourne.Photographs: Toby Melville/Reuters
Australia
Naturalisations (2001-2010): 1 million
Foreign-born population of total (2010): 27 per cent
Global rank: 7
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15 countries that lead in giving citizenship
Image: The lights system of the new Agbar Tower is tested in Barcelona.Photographs: Albert Gea/Reuters
Spain
Naturalisations (2001-2010): 0.6 million
Foreign-born population of total (2010): 15 per cent
Global rank: 8
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15 countries that lead in giving citizenship
Image: People walk on Zurich's main shopping street Bahnhofstrasse.Photographs: Arnd Wiegmann/Reuters
Switzerland
Naturalisations (2001-2010): 0.4 million
Foreign-born population of total (2010): 27 per cent
Global rank: 9
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15 countries that lead in giving citizenship
Image: View of the Turning Torso in the western harbour area of Malmo.Photographs: Rob Dawson/Reuters
Sweden
Naturalisations (2001-2010): 0.2 million
Foreign-born population of total (2010): 15 per cent
Global rank: 10
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15 countries that lead in giving citizenship
Image: Two women ride their bicycles on the Lindengracht in Amsterdam.Photographs: Michael Kooren/Reuters
The Netherlands
Naturalisations (2001-2010): 0.2 million
Foreign-born population of total (2010): 11 per cent
Global rank: 11
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15 countries that lead in giving citizenship
Image: Trams travel in downtown Milan.Photographs: Alessandro Garofalo/Reuters
Italy
Naturalisations (2001-2010): 0.2 million
Foreign-born population of total (2010): 8 per cent
Global rank: 12
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15 countries that lead in giving citizenship
Image: People cross a street after rainfall in central Auckland.Photographs: Stefan Wermuth/Reuters
New Zealand
Naturalisations (2001-2010): 0.1 million
Foreign-born population of total (2010): 23 per cent
Global rank: 13
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15 countries that lead in giving citizenship
Image: Japan's Mt Fuji, covered with snow, is seen through Shinjuku skyscrapers in Tokyo.Photographs: Kimimasa Mayama/Reuters
Japan
Naturalisations (2001-2010): 0.1 million
Foreign-born population of total (2010): 2 per cent
Global rank: 14
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15 countries that lead in giving citizenship
Image: A woman reads a book beside a bronze statue in front of Sejong Centre for the Performing Arts in central Seoul.Photographs: Jo Yong hak/Reuters
South Korea
Naturalisations (2001-2010): 0.1 million
Foreign-born population of total (2010): 2 per cent
Global rank: 15
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