The waters of Quitobaquito in southern Arizona have attracted diverse visitors for thousands of years.
Border wall construction through Organ Pipe Cactus National Monument in Arizona is encroaching on a site where people from many cultures have interacted for thousands of years.
Polls show that Americans feel more welcoming toward immigrants than they have in the past.
Americans have never felt warmer toward immigrants, nor have they ever been more supportive of immigration.
Many were confident the US Constitution was robust enough to check Donald Trump's worst excesses, but the real push back has come from elsewhere.
Trump isn’t the first to think a country can be full.
When President Trump declared the US full, little did he know he was wading into a centuries-old economic debate.
How man-made barriers can harm humanity for centuries.
A steel wall along the U.S. border near Tecate, California, cuts across Mount Cuchame, a site sacred to the Kumeyaay people.
The U.S-Mexico border runs through Native American territories. A wall would further divide these communities, separating children from schools, farmers from water and families from each other.
Trump has signed a law aimed at curbing sex trafficking.
AP Photo/Evan Vucci
Governments should heed the expertise of the grassroots nonprofits that witness this scourge firsthand.
President Donald Trump declaring a national emergency to build a wall.
The constitutional conflict between Congress and President Trump over his emergency declaration has potential to undermine centuries of checks and balances between the two branches of government.
Donald Trump prepares to give the 2018 US State of the Union address.
Trump is not the first US president to talk about border security, but he is the only one to make it an "urgent national crisis". Here is a handy deconstruction of President Trump's rhetorical strategy.
Trump before delivering the State of the Union address with Pelosi and Pence.
Doug Mills/The New York Times/Pool via REUTERS
Four scholars weigh in on President Donald Trump's State of the Union speech, exploring his statements on immigration, childhood poverty, the border wall and the investigations into his campaign.
Migrants on a ship intercepted offshore near the Libyan town of Gohneima, east of the capital Tripoli, in July 2018.
Libyan Coast Guard via AP, File
After 1.3 million migrants from the Middle East and Africa came to Europe in 2015, many countries built fences or closed their ports. That has pushed migrants to take riskier routes into the EU.
Donald Trump presents a wall design during a discussion on border security.
The partial shut-down has ratcheted up tensions within the Republican party and added to speculation that President Trump will face a primary challenge some time before the 2020 presidential election.
An artist’s sketch of Joaquin ‘El Chapo’ Guzmán at a 2018 pretrial hearing in a Brooklyn Federal courthouse.
Elizabeth Williams via AP, File
With its tales of bloody violence, corruption, international trade and entrepreneurial innovation, Guzmán's trial offers a telenovela-style explainer on Mexican cartels and their American clients.
Trump recently called the border a crisis during a televised address.
AP Photo/Carolyn Kaster
Trump and other leaders use the word 'crisis' to claim there's an emergency that demands urgent action. A leadership expert explains how to evaluate those claims.
U.S. President Donald Trump in McAllen, Texas.
History shows that Congress can play an important role in checking a president's power.
Trump meets with Schumer and Pelosi at the White House in December.
Trump, Schumer and Pelosi have fallen into a classic negotiation trap that often prevents deals from getting made, which has led to the shutdown stalemate.
Presidents have traditionally given Oval Office addresses during only the gravest of crises.
AP Photo/Carolyn Kaster
We asked experts on ethics, constitutional law and European political history to analyze Trump's Oval Office address. Here's what they heard in his speech about 'crisis' at the US-Mexico border.
President Donald Trump on the South Lawn of the White House.
AP Photo/Alex Brandon
The popular opinion is that presidents win government shutdowns, but a review of polling evidence paints a different picture.
Children play in the Indian Hills East Colonia near Alamo, Texas.
AP Photo/Eric Gay
One of the largest concentrations of poverty in the US exists in communities at the US-Mexico border called 'colonias.' These informal settlements lack access to basic infrastructure.
In this June 2016 photo, a border patrol agent walks near the secondary fence separating Tijuana, Mexico, from San Diego.
(AP Photo/Gregory Bull)
Free trade requires not just the free movement of goods, but of people too. If Donald Trump really wants the U.S. to have a competitive advantage, he should be encouraging more, not fewer, migrants.