Is there a clear teaching on the Church on this subject? I personally think race mixing should be avoided when genetic lines are too far apart. And historically and in scripture mass migration has always been a punishment by God.

The clear teaching is that every human being needs to hold the Catholic Faith, regardless of race.
The Church has never commanded miscegenation nor forbidden it.
Nor has She commanded nations to let themselves be invaded under the euphemism of "migration".

Good points.
Regarding the second point, that's because it will always be a minority who choose to do so. So it's NORMALLY not an issue for the continued existence of a people, of a nation, etc.

It's only an issue when a certain group of Red Sea Pedestrians conspires to destroy the race that is in the "engine house" of Christendom -- the vehicle God chose to bring the Gospel to the far corners of the earth. Europe had a special role to play.

And now they're being positively brainwashed and programmed to hate their own race, marry outside their race whenever possible, etc. That's not good, nor is it an accident.

Say what you will, but NORMALLY left to their own devices 9 out of 10 people, if not 99 out of 100, will prefer what they're more psychologically comfortable with -- what they are used to -- and that is their own race.

But that's only talking about honorable, life long marriage. Not hookups. With hookups (and equivalents), anything goes. Any fancy, any fetish, is the order of the day. Especially when influenced by powerful propaganda such as we see today with movies and other media.

But really, when we say "race" really we're talking about culture. That's the main issue. But not the only one -- there ARE differences in IQ for example between the major people groups (races).

IQ matters in many things, from delayed gratification, thinking about the future, impulse control, and so on.

So while it's quite possible to have a successful marriage outside your own culture, it's really putting marriage on Hard Mode, or an even higher difficulty setting. Remember, there are many things that couples disagree on, and Culture is what teaches your values on those different things. Hundreds of things. Freedom, group vs. individual, obedience, how to raise your kids, who's in charge, saving vs. spending, waiting vs. splurging, religion, morality, literally everything in daily life. When two spouses come from a similar background, it's more like Easy Mode. And marriage is hard enough. Why endeavor to swim UP stream rather than downstream?

Even if you both had Traditional Catholic as your "culture", there's still a lot of latitude for different peoples to implement day-to-day living: i.e., culture. You don't want to be from 2 different worldviews or ways of doing things. Marriage is hard enough.

1. No, the Church has nothing to say.
2. who checks “genetic lines” before choosing a spouse?
3. Can you give any examples of the mass migration in Scripture? It was God almighty who led the Isra3lites out of Egypt to the Promised Land.

3. When israel committed fornication with idols and false gods they were displaced with other tribes. Apparently modern jews are very mixed. The same can be said for the west.

The east split from the west, they get taken over by muslims and become more brown
England and other protestant nations have mass immigration.
Russia fails to become Catholic, Bolshevik jews take over, they also have an immigration and muslim problem
Catholic nations that betrayed Christ like France are the same, lot's of non-whites. Etc

I agree with Nadir and Emile.

Chiming in for two reasons:

1. When Emile speaks of "invaded under the euphemism of "migration,"" the reference point must be Europe and the Muhammadeans that are flooding into many of her states. Latino immigration into the U.S. is of a completely different character. It is rational to assume that enemies of Holy Mother Church could have and did foresee this 30 year flood of Latino immigration into the U.S. decades ago (given economics and early 20th century floods of Italian and Irish immigrants). Those same enemies would have been well incentivized to get the Mass into the vernacular ASAP to prevent the USA from becoming a truly Catholic nation--especially once it elected its 1st Catholic president...

2. Regarding Matthew's point about I.Q. differences--I don't put much stake in those claims...IQ test numbers are about as credible as NASA space photos in my humble opinion... Again, the reasoning goes back to certain enemies of Holy Mother Church (rhymes with "you-know-whos") who always supposedly score highest on those tests... so, if you have a group of people who are obsessed with controlling everything, who seperate themselves from others, who think they are superior to all others, and believe that all others are supposed to serve them, wouldn't it be obvious that they'd go through a lot of trouble to ensure that any kind of global human intelligence standard would always show them (and the least threatening of their enemies--the Asians) as "the smartest" and "least impulsive" of all humans? Seems like table stakes to me.

Meant to post this with my username. Apologies for the double post.

 I believe the church teaching on this has been addressed.  But we can know the cultural impacts just by looking at everyday life. Matthew is correct when he says creating mixed race families adds an additional layer of hardship because of cultural differences. Heck, marrying a Yankee is difficult. But I would imagine with the lack of suitable candidates and the use of internet for courtship there may be more of this going forward among traditional Catholics.  My own nephews are part Mexican so obviously there was race mixing somewhere in their ancestry. If I got a DNA test there would probably be Mongolian there because I'm Eastern European.

There are health concerns to take into account when it comes to the children that are the product of miscegenation. From what I remember, the rate of skin disease and depression, along with a myriad of other diseases, is significantly higher in those that have parents with dramatically different ethnic origins. Also in the past the Church has said that a nations culture and people must be protected. If everyone were to racemix you would effectively be destroying a people.

Also, from a purely superficial standpoint don’t you want your kids to look like you? People can try to tell themselves that it’s normal but I guarantee you that if anyone were to stumble across a black man and a white women, or vice versa, and their race mixed children, they are going to notice the abnormality in that. If I have children, I would not allow them to court individuals whose ethnic origins lay outside Europe and some parts of the Middle East.

From what you remember? Please amend to show source. Thumbs down Mr. Anonymous.

From what you remember? Please amend to show source. Thumbs down Mr. Anonymous.

Two seconds of Googling brought me to this study:

Health and Behavior Risks of Adolescents with Mixed-Race Identity
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1448064/

There are hundreds of other studies and statistics you can probably find yourself (if google has not buried them). My opinion on the subject has been formed over years of seeing random factoids and studies which I do not commit word for word to memory, just like how any other opinion is formed for most people. Moreso, my opinion is formed from wanting my kids and grandkids to look like me like I said in my original post. It does not really get that much deeper than that for me personally, but I know that others will not have that same bias (somehow). So, I provided a more utilitarian line of reasoning for others who are interested.