While it’s true that US visa applications can be difficult, the same is true for any first-world country. I was born in a third-world country, and ended up get

While it’s true that US visa applications can be difficult, the same is true for any first-world country. I was born in a third-world country, and ended up getting tourist visas to the EU, US, and Canada. US was by far the easiest - for me anyway. If you want a large global meeting in a safe country (I would never in my life go to Mexico) there will be visa issues.