Great question that I was just going to ask too! To clarify though, I'm answering how I buy BSV with USD. I think buying BSV with other cryptocurrencies is a bit easier right now (e.g. buying BSV with BTC). I want to know how US residents convert USD into BSV.
For me, it's sadly a bit complex, but this is the cheapest solution I've come across:
1. ACH transfer from my local bank to Binance.us account (allowed up $1000 daily for little to no fees)
2. Buy USDT (Tether) at Binance.us