When you use Facebook ads to grow your page and target a specific audience (in this case, the USA), the likes and followers you gain through these ads should predominantly come from that target location. Facebook's ad targeting allows you to specify the geographical location of your audience, ensuring that your ads are shown to people in the United States.
Once your page starts getting suggested to users, Facebook's algorithms will likely continue to recommend it to users in the USA, especially if your existing audience is primarily from that region. The geographical location of your admins does not necessarily impact the suggestions, as the algorithm is more influenced by the location and behavior of your audience.
However, keep in mind that organic growth and recommendations are influenced by engagement and interaction. If your content resonates with your target audience and they engage with it, your page is more likely to be suggested to similar users in the USA.
To enhance the effectiveness of your strategy, consider creating content that is relevant and appealing to your target audience, and actively engage with your followers to build a community around your page.