Why 15 Million....10 million was even better at the end of the...

Why 15 Million....10 million was even better at the end of the 50's. Mostly anglo/Irish. Why did we have to let in the Italians Greeks Turks, Vietnamese, Indians Chinese, Africans, South Africans. Your argument just does not stack up. A couple of Academics sitting in some backwater university told us what we already no. Nothing stays the same. We are hurtling through space in a galaxy amongst millions of other galaxies. Your type of thinking leaves us in a cave without a wheel or fire. Viva Planet Earth.