Hamas, the militant Islamic group that controls Gaza, blew up sections of a wall along the border with Egypt on Jan . 23 days after Israel sealed its border crossings with Gaza in response to intensified rocket fire against Israel.
Bush administration officials said Friday that they would begin using new technology to create a virtual fence along sections of the border with Mexico, and that construction had been completed on 302 miles of physical fence.
Trump wouldn't be the first president to seal off the southern border: Nixon closed sections of the border during Operation Intercept in an attempt to keep drugs from entering the U.S.
In exchange for its consent, Georgia sought transparency of trade on its border with Russia, a delicate issue because two sections of that border abut Abkhazia and South Ossetia.
As it happens, one of the first sections of the border wall was scheduled to be built on a national wildlife refuge in the lower Rio Grande, the Santa Ana, one of the region's most crucial habitats for migratory birds.
Critics say Israel has classified broad sections of border land as a "no-go zone" in which soldiers are allowed to open fire on anyone who enters, which military officials have strongly denied.
Other sections of the border have seen less progress.
Isis has erased sections of the border between Iraq and Syria, where it controls Raqqa and other areas.
Of 14 contested sections of the border, one especially seems to matter: Tawang in Arunachal Pradesh.
Militants blockaded the border crossing with Egypt at the southern town of Rafah on Wednesday January 4th, and later bulldozed sections of the border barricades.
