Does immigration strengthen or weaken a country?

A case for

Whether migration strengthens or weakens countries is highly context‑dependent. It depends on what kinds of migrants arrive, from where, from which cultural backgrounds, what qualifications they bring with them, and which qualifications are needed in the countries they migrate to. It also depends on how culturally similar the countries are, and so on. I would like to give two examples: one of at least partially positive migration combined with partly poor measures taken against it, and one of negative migration combined with poor implementation. My positive example would be the United States with irregular migration from South America. This migration undoubtedly leads to crime, drug smuggling, etc. Migrants from South America are proportionally more likely to commit crimes than U.S. citizens. However, the migration also has positive effects. Since the U.S. does not have a real welfare state, illegal migrants are forced to work, for example in agriculture. This strengthens the U.S. economy while at the same time allowing the migrants to live a better life — a win‑win situation. The idea, for example from the Trump administration, to deport illegal migrants is certainly partly reasonable, especially when it comes to criminals who have committed offenses, since they harm the state rather than benefit it. The problem, however, lies in the implementation. In practice, it is much easier to arrest and deport migrants who are working than criminals who operate underground and are therefore harder to catch. This leads to those who work being deported, while those who are criminal can continue their underground activities (greatly simplified, of course). So here we have a form of migration that is fundamentally reasonable but also has side effects such as crime. These should be addressed — but not by attacking the positive aspects of migration, but by weakening the negative ones. Otherwise, the country is weakened more than it benefits. A negative example of migration with poor implementation can be found in the EU. The extremely high migration from the Near and Middle East has significantly harmed EU states due to strong cultural differences, immigration into welfare systems (unlike in the U.S. — 40% of migrants from the 2015 refugee wave to Germany still do not have a job; studies from the Netherlands and Denmark show that migration does not stop being a net financial loss for the state until the fourth generation), an increase in Islamist terrorist attacks, and political polarization and destabilization of Europe as a whole resulting from these and other factors.

The first objection

You're actually proving my point. Both your examples show immigration *weakens* countries when implemented poorly—which is almost always. Your U.S. case admits migrants commit crimes at higher rates. Yes, they work agriculture, but at depressed wages that undercut citizens. That's not a win-win, it's exploitation dressed up as mutual benefit. And your own logic demolishes the "deportation is bad" argument: if we deported *criminals* effectively instead of workers, the economy stays strong minus the crime. The policy failure doesn't invalidate the need for strict borders. Your EU example is damning. Forty percent jobless after years, net financial losses for generations, terror attacks, political collapse. That's not context-dependency—that's catastrophic failure proving immigration *can* destroy countries. So which is it: does migration strengthen or weaken?