Which country uses USDT?

Could you please clarify for me which country specifically utilizes the USDT? I'm curious to know if there's a particular region where it's predominantly used, or if it's a global currency that's adopted across various nations. Is there a specific economic or technological reason why this country prefers USDT over other cryptocurrencies or traditional currencies? I'm interested in understanding the factors that influence its usage in that particular country. Additionally, is there any regulation or legal framework surrounding the use of USDT in this country that might contribute to its popularity? I'm keen on learning more about the practical application of USDT and how it fits into the financial ecosystem of the said country.