The bitcoin being bought with US dollars is part of the US economy.. how can I say that? Because its being bought my americans, and being spent on the goods americans buy (when they can spend it directly, which is becoming more common).
No if you buy goods and services in estonian that you keep in estonia then no it is not part of the us economy... If you buy estonia goods that you import then youve made an equal trade of wealth in the short term, the nature of the goods determines which economies wealth grows or diminishes from that.
You can not buy estonian land with US dollars, You think a estonian realtor would take US dollars? You would have to buy it with estonian money, the US dollars themself stay int he US economy. It is a wealth transfer, not a money transfer. Thinking in terms of money is confusing you. You act like those US dollars actually go over to estonian and some estonian now owns your US dollars, they dont.