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Jack Jenkins

Border walls work -- which is why so many countries, businesses, schools, organizations, and homes have and will use them for protection. Two-thirds of the world’s people live in countries that protect their borders with a wall or fence. Governments build these barriers because they are an effective way to keep people out. Many critics of President Trump’s proposed border wall think walls don’t work—or at least would not work at the Mexican border. But that is a lie and everyone, including those who utter such nonsense, know that it's a lie.
Democrats and other leftists often laugh at walls and fortified boundaries, dismissing them as hopelessly retrograde, ineffective, or unnecessary. Yet they still seem to fulfill their mission on the Israeli border, the 38th parallel in Korea, and the Saudi-Iraqi boundary: separating disparate states.
When the ancient Roman empire faced a challenge similar to what the EU struggles with some 1,900 years ago, the exasperated Roman emperor Hadrian ordered the construction of an 80-mile, 20-foot-high wall to protect Roman civilization in Britain from the Scottish tribes to the north. Currently, European nations have been desperate to keep the continent from being overwhelmed by migrants from North Africa and the Middle East. Like the Romans, some individual EU nations have resorted to building fences and walls to keep out thousands of non-European migrants, both for economic and national security reasons. Many Middle Easterners want to relocate to Europe for its material and civilizational advantages over their homes in Algeria, Iraq, Libya, Morocco, or Syria. Yet many new arrivals are highly critical of Western popular culture, permissiveness, and religion — to the extent of not wanting to assimilate into the very culture into which they rushed.
There were no walls between provinces of the Roman Empire — just as there are no walls between the individual states of America — because common language, values, and laws made them all similar. But fortifications gradually arose all over the outer ring of the Roman world, once Rome could no longer afford to homogenize societies antithetical to their own.
If Mexico and other Latin American countries were to adopt many of the protocols of the United States, their standard of living would be as indistinguishable from America’s as modern Scotland is from today’s Britain. Or, if immigrants from Latin America were to integrate and assimilate as rapidly as possible, there would be less of a need to contemplate walls.
Historically, as the ancient Roman empire knew, walls are needed only when neighboring societies are opposites — and when large numbers of migrants cross borders without necessarily wishing to become part of what they are fleeing to. These are harsh and ancient lessons about human nature, but they are largely true and timeless.

▪️Victor Davis Hanson: "Walls and Immigration — Ancient and Modern"