I think today if you're white as in caucasion, feel free to have as many as you want, we're quickly becoming the minority in this country. We've been so concerned with growth in the last 50 yr. and keeping the 1 and 2 children ideal that's reduced the caucasion populace. I come from a small family and had just one child in keeping with the American ideal, but now feel if you can afford a large family go for it. We've got some catching up to do. 
Why? This isn't some kind of battle between the races and frankly this view borders racism...who cares if we're not a majority? Does it make a difference outside of the fact that we won't get to spread the ridiculous message, whether openly or subconsciously, that Caucasian people are superior to other races?
And we're not really "becoming a minority" that quickly, if at all. As of 2007, 66% of the US was Caucasian. The next closest was 15% Hispanics.
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Except it's not just you and your kids you're effecting by having many kids. It's the world as a whole.
Well the world as a whole is affected in a lot of ways having kids isn't going to affect it anymore... There isn't less oxygen or space just cause people have more then 2-3 kids... as for a global thing If you teach your kids the right way to take care of the world then adding more also isn't a harmful thing... and how do you figure it isn't such a black and white issue?
Because I don't think the majority of people really know, or care, what goes on outside of their city and how big of a factor overpopulation currently is on a global level. And yes, every person who is currently having kids having 2-3 more would have a HUGE impact. If we assume a quarter of the population of the US alone is attempting to have kids, and they each decide to have 2-3, that's 150 million to 225 million more people...at only a quarter of the US population (which is only 75 million...consider 6 billion+ in the world). Not to mention less and less people per capita are dying per year due to technological and medical advances.
It isn't just about how well you can afford them or about teaching them "to take care of the world," whatever that means.