They know what they are doing. They know a lot of people read only the headline and assume from there, and that they will even share the link on Facebook, Twitter, etc based only on reading the headline and people will see that and also take their “understanding” only from the headline. Even so, this is an unusually shit-eating headline, even for modern media. They usually aren’t quite this bold. “Less than 100 miles from the border between two countries” is a hell of a way to avoid saying which country it was actually in, and the US flag image accompanying the headline (which would show up on reposts to Facebook and Twitter, given the way it shows links by default) drives home the assumption they want you to make. The people who actually read the article will quickly see the trick that’s been pulled, but they’re counting on that number being low, and that’s probably a safe assumption.