The United States currently has some of the strictest trading regulations in the Western world which has limited cryptocurrency trading in many ways.
source https://www.google.com/url?rct=j&sa=t&url=https://www.laprogressive.com/cryptocurrency/&ct=ga&cd=CAIyGmM2Nzk3ODA2ZWViNjVjODI6Y29tOmVuOlVT&usg=AFQjCNF7JEMsguYP5lA3s0PHhhspxQPqvQ