Are you saying this is just a continuation of what happened during the trump years ? Thank you.

Yep. Immigration numbers were trending upwards, and the last year before the pandemic hit (2019) border encounters showed a huge jump under Trump as well. You can see the massive spike in the 2019 numbers in the graph here:

cbp.gov - Sw border migration

It's not like migrant caravans didn't exist in 2018 and 2019, either:

Reuters: The migrant caravans: A common road toward different fates

The pandemic mitigated that. A lot. Emergency protocols to halt the spread of Covid stopped a ton of movement generally, and provided legal justification for sealing the borders even against asylum claimants.

Now that Covid's become endemic, that temporary slowdown in migration flows is over. The tools that were briefly available to slow migration flows are now gone. So we're now back to the root causes. Terrible circumstances in certain parts of Latin America are driving people to seek asylum in the U.S., and we haven't adjusted our border processing institutions to handle that higher load. So now we have a huge backlog of asylum cases, and no way of efficiently managing all those people while they await the hearings they're legally entitled to.