I'd think that Vatican City, as the theocratic seat of worldwide Catholic Christianity, would mainly use a visa category reserved for clergy and religious workers (R-1), anyway.
The Vatican applied for and the US granted 0 R-1 visas in 2018, 2017, 2016, 2015 and 2014.
I can go back further if you wish. Do you wish me to research and list more years? The data is available from the State Department, going back to 1997.
It doesn't really matter though does it? If the number is 0 back to 1997, will the argument suddenly be that 1996 and before were the huge years when lots of Vatican R-1 visas were issued? It is clear from the statistics that the claims being made about the US being racist, biased and unfair to Indian citizens are not only completely false but the assertions are the exact opposite of reality where Indian citizens are more privileged and favored than any other nationality. These are the facts. But facts don't matter these days. All that matters is race baiting and fabricated claims of hate incidents. It doesn't matter that Justin Smolley and others lied and the lies have damaged the US and create an environment in which people are terrorized by people making false claims. All that matters is the false narrative of chanting racism and denouncing America. Incite that mob. Create division. Truth and reality are unimportant when the violent revolution must be had by those who benefit from it.
I was being sarcastic. It's disingenuous to use outliers as though they are apples-to-apples comparisons.
It is especially deceitful to compare absolute numbers from a tiny city-state with among the lowest populations againt a giant country with the second-highest population. At least divide by each country's total population to get per-capita numbers.
Vatican City is an atypical country. As other posters mentioned, there are many reasons why no-one with a Vatican City passport wants a nonimmigrant work visa for the US. Every individual who might possibly be eligible to have Vatican City citizenship and who wanted to work in the US would likely use their primary passport--probably Italy.
You're cherry-picking. And the cherry you picked is rotten.