So I just learned that not all borders are fenced, very few of them are actually. So how are countries able to monitor thousands of kilometers of unfenced borders to fight off smuggling and illegal immigration ? Especially when it comes to long borders in arid/undeveloped areas, one example that comes to mind are the borders in Siberia.
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In addition to the other answers here, you cannot deny that an actual physical wall is effective.
Even biased PolitiFact is forced to begrudgingly concede (with cope) that Israel’s wall made illegal immigration go from 16k people a year to less than 20.
Source: [link](https://www.politifact.com/factchecks/2017/feb/13/ron-johnson/border-fence-israel-cut-illegal-immigration-99-per/)
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