What happened?

I find it hard to believe that the US and EU governments decided at the same time that it was a good idea to flood their countries with uncontrolled immigration.

We were told by the previous presidents' own spokesperson that our southern border was secure. Yet the news media occasionally showed videos of "caravans" heading to our southern border and thousands of foreign nationals entering our country (sometimes violently) at that same time. AI estimates approximately 10 million foreigners entered our country during that presidency.

Concurrently the Governments of France, Germany, Spain and other European countries decided to allow foreigners to enter their countries uncontrolled. AI estimates 25-30 million foreigners entered the EU in the last 6 years.

The US (and probably most of EU) provided these foreigners with food, housing, medical care, etc, at taxpayers' expense. The US and EU governments did not inform their citizens/taxpayers that they would have to foot these additional costs. This large influx of foreigners also severely impacted the availability of housing, food, water, electricity, schools, public transportation, roads, etc, for the citizens/taxpayers.

What reason did these governments have to allow uncontrolled immigration?