A system first deployed in South Africa in the early 20th century continues to influence the way travel is monitored today.
US Attorney General Jeff Sessions speaks to law enforcement officers in St. Louis.
Trump's administration plans to ramp up prosecution of unauthorized border crossings. Here's the story of how it became illegal in the first place.
We need to imagine new types of borders in this era of fervent fence building.
Doctors, landlords and now employers are expected to check immigration status.
Border control no longer stops at the border.
Irish Prime Minister Enda Kenny in March.
AP Photo/Geert Vanden Wijngaert
The Irish prime minister is in Washington for the annual shamrock photo op. But, with Trump in the White House, even usually placid U.S.-Irish relations are a bit dodgy.
While the UK argues over 'hard' or 'soft' Brexit, thousands of trafficked people continue to live in slavery.
Canadian Prime Minister Justin Trudeau is greeted by U.S. President Donald Trump.
Can Canada manage to keep up trade while also meeting US expectations for a safe border?
Jesus Blasco De Avellaneda/Reuters
What do border walls cost? And do they work?
Sgt. 1st Class Gordon Hyde, http://www.ngb.army.mil
Filmmakers sympathetic to the plight of Mexican and Central American migrants are using their films to counter the fug of misinformation.
The beefed up border between Bulgaria and Turkey.
Stefan Rousseau PA Archive
In an unequal, globalised world, should we be able to move between states as freely as we can within them?
A disused customs post on the border between Ireland and Northern Ireland.
The border across the island of Ireland is to become the only direct frontier with Europe, which is a major political problem.
Lettuce farmers from Oaxaca working in Mexico City.
AP Photo/Nick Wagner
US elections surfaced fears of Mexicans crossing into the US. But their numbers are actually in decline. Why are they choosing to stay in Mexico? Two migration experts went there to find out.
Could British border controls stretch to Dublin?
Niall Carson PA Wire
Proposals for the UK government to move its border to Irish ports of entry show how many options are now on the table.
An Indian coalmine worker walks along the Stilwell Road after a day’s work in Ledo town, at the Indian-Burmese border.
The Pangsau Pass between Burma and India illustrates the complex issue of borders in the region.
These days neither the public nor governments consider passports as a serious obstacle to freedom of movement.
In the 20th century, governments considered the “total abolition” of passports as an important goal and discussed the issue in several international conferences.
The Brahmaputra is known for its unpredictable fury. Assamese plains dwellers are often victims of floods but also earn a livelihood from the river.
At the heart of the Himalayas, the ongoing conflict between China and India for the hydro-power race will affect the whole region.
How the borrowed concept of gated communities is dividing rich from poor in the Peruvian capital.
On the US-Mexican border.
A recent study shows Donald Trump is out of date when he claims "people are pouring across our southern border".
Stand-off: Colombian and Venezuelan police at the border.
With drug trafficking, turf war, and craven politicking all at work, Colombia and Venezuela's fraught relationship has taken a turn for the worse.
New world, new customs.
As the world waits to hear what turn the Ukraine crisis takes next, it is wise for business leaders to stop and think about the questions raised by this unexpected clash of great powers. Some will worry…