Firstly, without the EU, the former Communist republics would be different shades of Ukraine. They are now democracies with tens of millions looking to buy the main thing that Britain sells: services. Britain has benefited tremendously from this highly lucrative market that simply does not exist if you step anywhere outside the border of the EU (or EFTA).
Secondly, while it's true EU migration has put some pressure on countries such as Britain, Germany or France, these migrants are needed in the big economies because if they weren't, Britain in example would not accept millions of Indians, Pakistani and Africans along with them. Unlike those 3 groups, EU migrants are more likely to be quickly assimilated, they usually speak English and they don't belong to vastly different cultures because their native cultures are heavily influenced by Western culture.
Finally, the whole is greater than the sum of its parts. The EU can do much more as a single entity than any of its members. As one of the big 3 in the EU, Britain is in a position where its voice matters. Outside the EU, it will be former empire who left the most ambitious political project mankind has ever undertaken because it didn't like the Poles who wore Nike tracksuits and made jokes in their own language.
The UK entry requirements for say Australian nationals is exceedingly high, meanwhile we have streets full non English speaking Roma who spit seeds everywhere, terrorise the locals and undercut prices on the lowest paid jobs in order to claim in work benefits which are readily available to migrants.
I can't fathom why that benefits us.
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