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Ultimately, our answer is simple – the community. Today’s NA community traces its roots all the way back to the beginning of League’s open beta in April 2009. Starting from a grand total of three hundred players, in less than six years the community has swelled to millions of us. We've all been there together through League’s constant evolution, and continue to welcome new players from across North America every day. For us, the preservation of the NA community is worth any effort, and with that in mind we've focused all our energy on creating a stable, long-term, single-server solution.

This is utter bullshit. The community? Fuck that. Is EU not part of the 'community'?

You can still be part of the League community no matter which server you play on. It is infinitely better to have two separate servers that give the playerbase 30-40 average ping rather than one server that gives the playerbase 60-70 ping average.