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Congress has about another month before Deferred Action for Childhood Arrivals, the Obama-era program that protects young undocumented immigrants from deportation (and which President Trump terminated in September), officially comes to an end. It remains to be seen whether Congress will legalize these so-called Dreamers, and what concessions will be made in return. But this much is certain: Any deal will include appropriations for enhanced border enforcement.

We’ve been here before. The last major immigration reform bill, the Immigration Reform and Control Act of 1986, which was signed by President Ronald Reagan, legalized nearly three million undocumented immigrants in exchange for increased enforcement along the United States-Mexico border. (It also legislated sanctions against employers who knowingly hired undocumented workers.) The law was more than just a compromise between pro-immigrant liberals and pro-enforcement conservatives. It embodied the idea that we could “wipe the slate clean” by legalizing the undocumented already here and preventing future unauthorized entries.

This idea, which continues to shape the national debate about immigration, is based on the false premise that the nation’s borders can be made impregnable. In truth, undocumented migration is not an aberration of “normal” immigration. It is the inevitable result of any general policy of immigration restriction. Restriction creates two streams of immigration, lawful and unlawful. It is a conceit of the sovereign power to think that it can have only legal immigration.

The history of immigration in the United States demonstrates this. The Chinese exclusion laws of the late 19th century led to unlawful entry by so-called paper sons (those born in China who claimed they were sons of United States citizens) and spawned an immigration bureaucracy based on extreme vetting, detention and deportations, all tactics that were largely unsuccessful.

The National Origins Act of 1924 reduced general immigration to 15 percent of pre-World War I levels, setting quotas that discriminated against Southern and Eastern Europeans. It also created the Border Patrol. The result was to make undocumented migration a mass phenomenon.