There are several reputable BTC exchanges in the United States where users can buy, sell, and trade Bitcoin. Some of the most popular exchanges include Coinbase, Kraken, Gemini, and Binance.US.

Coinbase is one of the largest and most well-known cryptocurrency exchanges in the United States. It offers a user-friendly platform that is great for beginners, as well as advanced trading features for experienced traders. Coinbase is known for its high level of security and regulatory compliance, making it a trusted option for buying and selling Bitcoin.

Kraken is another popular BTC exchange in the United States that offers a wide range of cryptocurrency trading pairs. It has a reputation for low fees, high liquidity, and a strong focus on security. Kraken also provides advanced trading tools and features for users who want to engage in more complex trading strategies.

Gemini is a New York-based BTC exchange that is known for its regulatory compliance and commitment to security. It offers a simple and intuitive trading platform, as well as a wide range of cryptocurrency trading pairs. Gemini is also one of the few exchanges in the United States that is fully licensed and regulated by the New York State Department of Financial Services.

Binance.US is the American arm of the popular global cryptocurrency exchange Binance. It offers a wide range of cryptocurrency trading pairs, as well as advanced trading features and tools. Binance.US is known for its low fees and high liquidity, making it a popular choice for both beginner and experienced traders.

Overall, there are several reputable BTC exchanges in the United States where users can buy, sell, and trade Bitcoin. It is important to do thorough research and choose an exchange that meets your specific needs in terms of security, fees, trading features, and regulatory compliance.