You can always see where a token is traded on CoinMarketCap.

$HIVE is on Binance, Huobi, and Bittrex.

So the options are:

1. As metzli suggested, purchasing something like LTC on another exchange and using BlockTrades. This is the easiest option if you already have an account on a US exchange, and don't want to deal with additional accounts/sharing of your information. You will probably pay a higher rate vs Bittrex or Binance.
2. Bittrex requires some KYC information, but should allow you to link your account and make direct purchases.
3. Use a VPN, and make an account on Binance.com. This is what a lot of people do, but how comfortable you are with that is really up to you. This would be similar to step 1, where you would purchase a coin on an US exchange like Coinbase, and then transferring it to your Binance.com wallet and then making a purchase.