Can US citizens use Uniswap?

Can I ask a question about the use of Uniswap for US citizens? I've heard that there are some restrictions and regulations surrounding cryptocurrency exchanges in the United States. So, is it possible for US citizens to use Uniswap to trade cryptocurrencies, or are there any limitations or restrictions that they should be aware of? I'm particularly interested in understanding the legal implications of using Uniswap as a US citizen.