I'll be honest, I don't think I've ever actually heard someone give a reason why the US having open borders would be a bad thing. You are a country of immigrants, and your greatness was built upon that foundation.

Yet now it's getting undone for seemingly no reason. But I hope that there would actually be one, so please enlighten me and the other commenters.

> You are a country of immigrants, and your greatness was built upon that foundation.

This makes a great talking point, but those immigrants eventually assimilated into the culture, and also importantly, they were specifically allowed to come because the US needed more people in order to power its economy. The Chinese came to build the railroad, the Irish and Italians and Germans came over and worked in factories and as police and many other industries. This was badly needed 100 years ago.

Today most illegal immigrants are uneducated and are either working in the unofficial economy or in service-sector jobs, which depresses wages for everyone with low education. We don't need every restaurant to have an unending stream of desperately poor would-be busboys and dishwashers, or for Uber to have a stream of poor drivers. Or for rich people to have an ample supply of housekeepers paid in cash. All that does is keep wages in the toilet for working people.

But about open borders, why are so many Latin American countries such bad places to live that so many of their people want to come to the US? Open borders just means anyone can walk right in and bring all of their problems with them, not to mention their drug and human trafficking operations and the criminal gangs that operate them. We already have enough of that as it is.

No Western country can stay civilized with open borders. Anyone with half a brain can see how it is going in the UK and France, where they are only a bit more "open borders" than the US has been. Thankfully for Americans, Latin-American culture is more compatible with Western culture than Islamic culture is.

There is no defensible reason.

Because there is no ethical or logical argument for borders that isn’t pure bigotry and nationalism