What countries can use Kraken?

I'm quite interested in the cryptocurrency exchange platform Kraken. Could you please tell me which countries can use Kraken? I'm particularly curious about the regulatory status of Kraken in different countries. For instance, are there any restrictions or limitations on the use of Kraken in certain countries? If so, what are the reasons behind these restrictions? Additionally, are there any plans to expand Kraken's services to more countries in the future? Thank you for your time and assistance.