HC, the Open Border political slogan isn't factually accurate. In fact we've become one of the hardest nations to immigrate to. No country has open borders anymore.

SNIP Open Borders in the Modern World

As of 2022, none of the countries in the world officially have open borders. While a few countries have open border agreements with a select few other countries (Europe’s Schengen nations being the most prominent example), the majority of nations opt instead for border policies that place at least a few additional limitations on individuals’ ability to enter or exit the country. These restrictions are typically intended to safeguard national security or preserve business ecosystems.

That said, in some countries official policy may differ from actual practice. Modern countries may have unintentionally open borders. These countries either have no laws at all regarding their border policy or have a more restrictive border policy that goes unenforced because the government lacks the funding to finance proper border controls.

While open borders are currently extinct at the international level, multiple countries have had open borders at times throughout history. The early United States, for instance, owed the majority of its population to unfettered immigration enabled by an open border policy and easy citizenship process. Today, however, the situation has changed. U.S. immigration is tightly controlled and the country has gone from being one of the easiest countries to immigrate to to one of most challenging countries to immigrate to thanks to more restrictive policies.

Top 10 countries with most open borders:
Singapore 6.03
Hong Kong 5.81
Sweden 5.65
Switzerland 5.57
Denmark 5.56
Germany 5.55
Netherlands 5.55
Canada 5.54
United Kdm 5.4
France 5.36

The US is 15th.
worldpopulationreview.com - Countries with open borders

In the past decade we've become the 7th hardest country to immigrate to. (Biden had switched and was hardening.)

worldpopulationreview.com - Hardest countries to immigrate to