Face it, Asians and a lot of Jews are better parents. There is nothing they do that our grandparents did different.
Those commumities do not have societal pressure and guilt shaming forces on them to marry outside their their peoples.
The more homogenous you are the more you can keep your societal norms intact and from being demanded to be dismantled from others.
This is why we as a nation, one of many reasons, are going down the tubes.