Search for the public records around “US southern border encounters.” All of this stuff has been logged and quantified for decades. We’re up around 2.4m annual encounters. Previous large peaks hit 1.6m annually. During the Obama years it was floating around 0.4m annually.

Pew has a good breakdown, but it hasn’t been updated for 2023. It ends at 2021, and things have only gone up since then.

https://www.pewresearch.org/short-reads/2021/11/09/whats-happening-at-the-u-s-mexico-border-in-7-charts/

Many towns / states that support sanctuary are hitting budget ceilings for helping refugees and asylum-seekers. Racists and xenophobes have been crying wolf for decades, and unfortunately, that has made many people dismiss any “border crisis” claims they hear, even when the data supports the claim.