Lost in the sound and the fury of the temper tantrums that erupt among liberals each time Donald Trump’s proposed border wall is mentioned is the fact that border walls reduce immigration effectively and efficiently — which is perhaps why liberals are so opposed to them.

One country that is well aware of the effectiveness of walls is Israel. While Americans mostly worry about cheap labor and the odd rapist or gang member crossing their southern border, the Israelis are surrounded by Muslim Arabs who not only think they are subhuman, but also want them dead.

After the unrest and instability resulting from the Egyptian revolution, Israel began to construct a wall along its border with Egypt at the Sinai Peninsula, where illegal migrants and terrorists were crossing easily and frequently. For the record, 14, 715 migrants (or potential terrorists) were caught trying to enter Israel via the Sinai border in 2010. In 2011 17,298 were apprehended, and another 10,440 in 2012. Construction of the Sinai border fence — in all its 16-foot-high, razor-wired glory — finished in January 2013.

By mid-November 2013, the grand total of foreigners caught trying to cross the border was 36, according to government figures — a drop of 29,000 percent. Even if another 36 managed to get in during the final month and a half of 2013, it would still represent a reduction of over 14,000 percent.

Macedonia is another country with a successful record of wall-building. In November 2015, under the overwhelming pressure of the Muslim migrant crisis that began that year, Macedonia began construction of a 10-foot-high fence along their border with Greece — a main point of entry for migrants travelling to Europe.

[lz_bulleted_list title=”Walls Work” source=government of Israel, government of Hungary, NPR, Wall St. Journal]Apprehensions at Israel-Sinai border fell by 29,000% year after completion of wall|Crossings at Hungarian borders with Croatia and Serbia fell by 31,586% month after completion of wall|Crossings at San Diego border with Tijuana fell by 95%|Macedonian wall at Greek border successfully prevented at least 11,000 Muslim migrants from entering country[/lz_bulleted_list]

Macedonia’s fence was a big success. While no official statistics detailing border crossings before and after the fence’s construction are available, 54,000 Muslim migrants are trapped in Greece due in large part to the Macedonian fence, the Wall Street Journal reported Wednesday.

Eleven thousand are stranded at Idomeni on the Greek-Macedonian border — that’s 11,000 who otherwise would have crossed into Macedonia were it not for that country’s “big, beautiful fence,” as Trump describes his plans for a Mexican border fence.

Of course, Macedonia modeled its border wall on Hungary’s border barrier. Hungary suffered immensely during the early months of the border crisis. In May 2015, over 11,000 migrants entered Hungary illegally, and the number entering each month grew steadily thereafter. In September 2015, over 130,000 migrants crossed the Hungarian border.

Hungary’s wall, built along the Serbian and Croatian borders, was completed by the end of October. In that month, nearly 100,000 migrants were able to cross the border illegally.

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However, in November 2015, the first month in which Hungary had a secure border barrier, the number of migrants who entered the country was 315, a reduction of over 31,000 percent from the previous month. In addition to Hungary and Macedonia, Austria, Slovenia and Bulgaria have built walls to stem the tide of the present Islamic onslaught against Europe.

But if Americans are truly curious to know whether a wall on the U.S.-Mexico border would be effective, they need not necessarily look to Europe. Indeed, they can look to the U.S.-Mexico border itself.

The 14-mile stretch between San Diego and Tijuana was a favorite point of crossing for illegal aliens, and one which saw heavy use during the 1980s. “It was an area that was out of control,” border patrol agent Jim Henry told NPR in 2006. “There were over 100,000 aliens crossing through this area a year.”

That was before a double border wall was constructed there in the 1990s. After the construction of the wall, illegal border crossings in the area fell roughly 95 percent, from 100,000 to just 5,000.

“Here in San Diego, we have proven that the border infrastructure system does indeed work,” Henry said. “It is highly effective.”

In short, walls work.