The Evolution of Ideas in South American Immigration Policy

South America has long held a reputation as a global leader in how it treats people moving across borders. For decades, observers have pointed to the region's progressive laws, its constitutional guarantees of the right to migrate, and its refusal to criminalize irregular entry as proof of a unique, human-rights-focused approach. This image stands in sharp contrast to the restrictive and often hostile immigration policies seen in many other parts of the world. However, a gap has always existed between these high-level promises and the messy reality of how policies are actually applied on the ground. To understand whether South America's reputation as a rights-based pioneer is truly deserved, researchers needed to look beyond the headlines and the landmark laws. They needed to examine the vast, often overlooked body of everyday rules, decrees, and administrative orders that make up the actual machinery of governance. In the study of public policy, ideas are not just abstract thoughts; they are the blueprints that shape how governments act. When these ideas are written into law, they become the rules that determine who can enter, who must leave, and what rights a person holds while they are there.

A team of researchers set out to test the region's reputation by analyzing the entire legal record of immigration policy across nine South American countries from 1900 to 2024. Instead of relying on a few famous laws or political speeches, they gathered a massive collection of 2,158 legal documents, including statutes, decrees, and resolutions. They then broke these documents down into over 34,000 individual text blocks, treating each block as a single unit of policy. To make sense of this enormous amount of text, they used a sophisticated computer program trained to recognize three distinct ways of thinking about migration. The first is an anti-immigration approach, which views migration as a risk to be stopped through strict borders and deportations. The second is a rights-based approach, which treats migrants as individuals with universal human rights regardless of their legal status. The third is a managerial approach, which sees migration as a practical phenomenon to be steered for the mutual benefit of sending and receiving countries, focusing on efficiency and economic utility rather than ideology or strict exclusion.

The researchers found that the story of South American immigration is not the simple tale of a rights-based revolution that replaced older, stricter ways of thinking. Instead, the most common and enduring idea in the region's laws is the managerial approach. Roughly 43 percent of all the legal text they analyzed falls into this category, making it the default setting for how the region governs migration. This managerial mindset treats people moving across borders as a resource to be managed, a perspective that has remained stable across different political regimes and eras. The rights-based approach, while present and growing, is actually the least common of the three main ideas. It appears most frequently in major, high-profile laws but is much less common in the daily administrative rules that actually control the flow of people. The study suggests that the region's famous reputation for being a rights leader is partly a measurement effect: because rights-based laws started from a very small historical base, their rapid growth looks dramatic, but they have not displaced the underlying managerial system that governs most of the region's daily operations.

The history of exclusion in the region also turned out to be different from what many expected. Conventional wisdom often links strict, anti-immigration policies to the military dictatorships of the Cold War era in the 1970s and 1980s. However, the data showed that the peak of anti-immigration language actually occurred much earlier, during the years between the two World Wars and into the early 1940s. During this time, governments institutionalized exclusionary ideas through routine administrative rules, creating legal mechanisms for deportation and national-origin restrictions long before the authoritarian regimes of the late twentieth century took power. This means that the tools for restricting migration were built into the system during a period of state-building and demographic anxiety, and later dictatorships simply operated within a legal framework that had already been set up to exclude.

The study also revealed that the type of legal document matters greatly. While major laws passed by legislatures are more likely to contain rights-based language, the vast majority of recent immigration rules have been created through executive decrees and administrative resolutions. These lower-level instruments are overwhelmingly managerial in nature, focusing on the technical details of how to process and control migration. In the most recent years, from 2020 to 2024, the production of these administrative rules exploded, with resolutions alone accounting for more than half of all new legal blocks. This shift suggests that while the region may be making grand promises in its constitutions and major statutes, the day-to-day reality of migration governance is increasingly driven by technocratic, efficiency-focused rules that prioritize management over rights or strict exclusion.

Ultimately, the research paints a picture of a region where the ideal of human rights exists, but it sits on top of a deep, stable foundation of managerial governance. The rights-based provisions are real and have grown significantly, but they function more like an overlay on a system that was never fundamentally redesigned. The region's reputation as a rights leader is not entirely false, but it is incomplete; it reflects a specific kind of legal change that has not yet reached the routine machinery of the state. By looking at the full body of enacted law rather than just the most visible moments of reform, the researchers showed that the ideas which truly shape governance are often the quiet, technical ones that persist across decades, rather than the loud, ideological shifts that capture the news. This approach offers a clearer, more grounded understanding of how ideas become policy, revealing that the true character of a region's immigration system is found not in its highest promises, but in its most ordinary rules.