Which countries are closest to the US?

I'm curious to know, which countries are considered to be the closest to the United States in terms of geography, culture, or economic ties? Are there any specific nations that share a border with the US, or perhaps those that have strong historical, political, or economic connections? Additionally, are there any countries that, despite not being geographically close, have a strong cultural affinity or economic partnership with the US? I'm eager to learn more about the international relationships that the US maintains and how they shape the global landscape.