Depends on the platform tbh, they don't all work the same.
TikTok is the only one where your location really matters. It looks at your IP, SIM, GPS and phone settings together, and if they point to different countries your videos can end up getting pushed to the wrong audience. That's why people go with a US SIM or a residential proxy instead of a cheap VPN. Data center VPNs are easy to spot.
YouTube, IG, FB and X care way more about your content than where you post from. English, US topics, US trends and posting when Americans are awake (evening EST) does most of the work there.
If you want it guaranteed, just run ads. All of them let you target the US from anywhere.
One thing though, if your plan is TikTok monetization, faking the location won't get you in. They want you actually living in an eligible country with your account registered there.