Past projects show border wall building is complex, costly | AP News
Building border walls and barriers: What the research says
How Much of President Donald Trump's Border Wall Was Built? | Politics | US News
President Obama Also Faced A 'Crisis' At The Southern Border : NPR
Nearly 700 Miles of Fencing at the US-Mexico Border Already Exist - ABC News
Did Donald Trump deliver on his 2016 immigration and border promises?
Trump says walls work. It's much more complicated | PBS NewsHour
Border Wall Builders Carry On, But Projects May Never Be Completed : NPR
A Section of Border Wall in Texas Cost $27 Million a Mile. It's Being Foiled by $5 Ladders. – Texas Monthly
2020: The Year Trump's Wall Rises or Falls - The Texas Observer
Obama deportations vs. Trump: Context is everything. | CNN Politics
What do we need to know about the border wall?
Fact check: Mexico never paid for it. But what about Trump's other border wall promises?
PolitiFact | Donald Trump's border wall: how much has been built?
Nearly 700 Miles of Fencing at the US-Mexico Border Already Exist - ABC News
Judge stymies Trump's border wall by invoking GOP law targeting Obama- POLITICO
Illegal immigration to the United States - Wikipedia
A Call To Action: Reestablishment Of The US-Mexico Border Health Commission | Health Affairs
How the U.S. Patrols Its Borders
Mexico–United States barrier - Wikipedia
In 2006, Democrats were saying 'build that fence!' - The Boston Globe
The Wall: The real costs of a barrier between the United States and Mexico
AP fact check: Donald Trump and the U.S.-Mexico border | PBS NewsHour
