And so is the past. Migration and mingling are essential to human success in the past, the present and into the future
If the history of life on Earth can teach us anything, it is this: as conditions change, species either adapt or become extinct. In our time of considerable environmental change, humanity should consider its options. No species, even the almighty Homo sapiens, can stop evolution completely. But we can choose to limit our capacity for ongoing biological adaptation in an effort to remain ever the same by keeping populations isolated. Of course, such decisions are not made by humanity as a whole but by individuals and governments. Nationalism and xenophobia, on the rise in the US and Europe, threaten to decrease genetic exchange between populations, stifling our ability to continue evolving and adapting.
Alternatively, we can embrace immigration and globalisation in an effort to position ourselves for a brighter future. The underlying causes of the current high rates of human migration are likely to persist, and perhaps to increase, as the global human population continues to grow. Access to natural resources such as fresh water have long driven population movements, and these might become even more important drivers of migration as the world’s population expands. Likewise, as economic development proceeds, the amount of resources used by each person will continue to rise, putting further pressure on scarce resources and further motivating people to move in search of better conditions. Sea levels are expected to continue rising as a result of global climate change, and this is likely to drive large-scale population movements away from low-lying coastal areas as they become uninhabitable. In short, the reshuffling of populations that results from the movement of people around the world will continue to shape the structure of our gene pool – and, by extension, our future evolution – for many generations to come.
Race Mixing happened due to nationalistic wave. Now, in India, the erstwhile plebian got freedom for all their colonisers, and from the year 1947 A.D., despite our PRIME MINISTER being an outright racist, these people eventually managed to kill all the noble breeds, and race mixing, and brain washing was part of this propaganda.
And not to forget, now days, youngsters don't want to take chances, and appear as staunch racist, because, they LIVE WITH RACE MIXED PEOPLE, and chances are that a PURE BREED BOY/GIRL will be MOCKED.
And most of the pure breeds are those, whose ancestors were aristocrats or ruling class. It is for the first time, that lot of us have been made to mingle with plebians or workers, so we are not able to handle them, while those people have outright grudge against nobility, that our ancestors exploited them.