Daniel Greenfield has the answer, but can it be done? His solution? Demographics and Culture - but not the way you might think:
Taking back America demographically is a matter of having enough
children within a cultural structure that passes down the values of
adults to the children, while focusing on limiting immigration as much
as possible. This isn't an impossible task.
The Amish population doubles every 20 years and they retain the majority of their children within their communities despite the obvious appeals of the outside world. There are 250,000 Amish in the United States and Canada now. By 2040 there will be over a million of them.
Utah has the highest fertility rate in the country and 9 out of 10 children are born to married couples. The Mormon Church is slowing down its expansion, and is having some retention and birth rate issues, perhaps due to its liberalization and growing investment in overseas missionary work, but its numbers are still a reminder of what is possible.
Demographics can be deceptive, because what we are really talking about are the economic and cultural factors that dissuade large family sizes and that alienate children from the values of their ancestors. What we are really talking about is a clash between progressives and traditionalists.
As an Orthodox Jew, I represent a group that is at the front lines of the clash. In the last century and a half, Jewish progressives have done everything possible to destroy Jewish religion, values and even nationhood. For half that time they were enormously successful, wreaking havoc across entire communities, using state power to force parents into their own schools, and building a literary and cultural infrastructure aimed at ridiculing and destroying traditional values.
They are still at it today, and their tactics and propaganda are as bad as they ever were, but they also losing. While the progressives embrace the culture of abortion and gay rights, the traditionalists have children. Within a decade, a majority of New York Jews will be traditionalist and the impact of that is already being felt in elections. The progressives have ramped up their usual hate campaigns against Orthodox Jews, which is why you see so many negative stories in the media, but the demographics of their progressive culture doom them to extinction.
This same outcome would have taken place nationally in the clash between American traditionalists and progressives, if not for the ace in the hole of immigration. And yet immigration is only half the picture. The bigger half of the picture is culture.