What's up with sex trafficking in Britian?

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I've been following international news more often since 2010 and I've seen so many of these cases.

http://www.bbc.com/news/uk-england-leeds-36559092

This one just broke today. It's one of many more that have been going on this decade.

http://en.wikipedia....itation_scandal
http://en.wikipedia....rafficking_gang
http://en.wikipedia..../Derby_sex_gang
http://en.wikipedia....Oxford_sex_gang
http://en.wikipedia....ristol_sex_gang
http://en.wikipedia....elford_sex_gang
http://en.wikipedia...._sex_abuse_case
http://en.wikipedia....esbury_sex_gang
http://en.wikipedia....anbury_sex_gang
http://en.wikipedia....ighley_sex_gang

Why is this such a huge issue in the U.K? We have plenty of immigrants in Canada and we don't see nearly as many sex rings here. I don't get it.

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What's up with sex trafficking anywhere?

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What's up with sex trafficking anywhere?

It's not as common here yet we have similar communities. Just find it weird that it's happening there so much.