Index/Locations/U.S.-Mexico Border Infectious Disease Surveillance Project

U.S.-Mexico Border Infectious Disease Surveillance Project

Fact-Checks

42 results
Dec 9, 2025
Most Viewed

Did Obama keep immigrant children in cages?

Yes — facilities with chain‑link enclosures often described as “cages” were used to hold migrant children under the Obama administration, especially during the 2014 surge; those same types of enclosur...

Dec 10, 2025
Most Viewed

How do border crossing numbers during the Biden presidency compare to previous administrations?

Border encounters during the Biden presidency rose to multi-year highs through 2022–2023 (peaking in December 2023 at nearly 250,000 encounters in a month) and then fell sharply after policy changes i...

Dec 18, 2025
Most Viewed

How many unaccompanied illegal minors has the trump administration found?

The reporting contains multiple, conflicting tallies: a Biden-era total of hundreds of thousands of unaccompanied children crossing since 2019 is widely cited, while the Trump administration and allie...

Nov 21, 2025

How has the number of undocumented immigrants in the US changed since 2020?

Estimates of the number of undocumented (unauthorized) immigrants in the U.S. rose sharply after 2020, with Pew Research Center reporting a jump from roughly 10.5 million in 2021 to a record 14 millio...

Oct 28, 2025

How many people crossed the U.S.-Mexico border without authorization each year from 2021 to 2024 according to CBP?

The most direct CBP figures available for Fiscal Years 2021–2024 report of 1,956,519 in FY2021, 2,766,582 in FY2022, 3,201,144 in FY2023, and 2,901,142 in FY2024; these are the annual encounter counts...

Dec 12, 2025

How have immigration and border-crossing patterns changed where the wall exists versus where it does not by 2025?

By mid‑2025 detected unauthorized crossings at the U.S.–Mexico border dropped sharply from 2024 levels — monthly sector totals fell by more than 80–90% in some months and the Border Patrol recorded ro...

Nov 21, 2025

How much did federal spending on border wall construction total between 2017 and 2025?

Federal spending on U.S.–Mexico border wall projects is reported in widely varying totals depending on which years, accounts and proposals are included: contemporaneous reporting and government estima...

Oct 6, 2025

How has the Biden administration's handling of asylum seekers changed since 2021?

The Biden administration began 2021 promising a restoration of asylum access but has since implemented a series of rules and proposals that significantly tighten eligibility and accelerate removal, cu...

Jan 19, 2026

There are pictures of women with clipboards talking to migrants at the border wall who just crossed, then helping them into vans. What is that?

Photographs showing women with clipboards talking to migrants at the border wall and then helping them into vans can depict a range of actors and activities — from humanitarian volunteers, shelter or ...

Jan 13, 2026

Which metropolitan areas and border counties within high-immigration states have the highest concentrations of undocumented residents in 2025?

In 2025 unauthorized immigrants remain concentrated in a small set of large metropolitan areas—above all the New York and Los Angeles metros—and are still disproportionately located in a handful of hi...

Nov 29, 2025

How many migrant encounters were recorded at the US border each year of the Biden administration (2021–2025)?

CBP encounter data show extremely high annual totals in early Biden years and a sharp decline by 2024–2025: CBP reported about 1.66 million Border Patrol encounters at the U.S.-Mexico (southwest) bord...

Nov 9, 2025

What are the current US immigration policies affecting border crossings?

The current U.S. immigration regime affecting border crossings is a patchwork of statutory law, recent executive actions, and administrative rules that together tighten asylum eligibility, expand enfo...

Jan 19, 2026

How many total miles of border barriers existed before 2025 and how were they counted?

By most official counts used by the U.S. government before January 20, 2025, there were roughly 719–744 miles of installed barrier described as “primary” and “secondary” fencing along the U.S.–Mexico ...

Jan 12, 2026

How many migrant children were separated under the Trump zero‑tolerance policy and how were reunifications tracked?

Estimates of how many migrant children were separated under the Trump administration’s “zero‑tolerance” policy vary by source — official agency tallies and later government reviews and reporting put t...

Dec 6, 2025

Which segments of the wall remain in place, were completed, or were dismantled as of 2025?

As of 2025, CBP’s baseline "existing barrier (prior to 1/20/2025)" consisted of roughly 702 miles of primary wall and about 76 miles of secondary wall; since January 20, 2025 the agency has been updat...

Dec 5, 2025

How did monthly US-Mexico border encounters under Biden compare to Trump and Obama administrations?

Monthly U.S.–Mexico border “encounters” were far higher on average during the Biden presidency than during the Trump presidencies, with CBP recording roughly 11 million encounters over Biden’s four ye...

Dec 5, 2025

How did Title 42, Title 8, and parole policies under Biden affect apprehension numbers?

Title 42 allowed roughly 2.8 million Border Patrol expulsions from March 2020 through its end in May 2023, dramatically reducing formal Title 8 processing during that period . The Biden administration...

Nov 28, 2025

How has the number of undocumented immigrants in the U.S. changed since 2010 and what drove those trends?

Since 2010 the best-available estimates show the U.S. undocumented (unauthorized) population was roughly stable to slightly down in the 2010s, rose again after 2020, and by mid‑2023 many researchers p...

Nov 27, 2025

Which sections of the border wall remain unfinished or have been removed and why?

Coverage shows the U.S.–Mexico border barrier is neither continuous nor static: roughly 702 miles of “primary” barrier existed prior to Jan. 20, 2025, with many gaps, new state- and federal-funded pro...

Oct 27, 2025

How many illegal immigrants were apprehended at the US-Mexico border in 2024?

The most reliable, directly reported figure for Fiscal Year (FY) 2024 Border Patrol apprehensions between ports of entry is , a 25% decline from FY2023’s 2,045,838, as shown in CBP’s weekly Border Upd...