Julie C. answered 03/24/19
Certified English/ Reading Teacher
The phrase "this country" is dependent on the context of the speaker/writer. If someone says "this country has 10 million people" without any specification of what country they mean, you can assume that they mean the country they are currently in. So, if someone is in Great Britain and says "this country has 10 million people," then that person is talking about the country of Great Britain.
However, in your second example, the phrase "this country" refers to the USA. You know this because the writer/speaker introduces the country in the first sentence: "Patent law is quite complicated in the USA. In this country blahblahblah..." The phrase "in this country" functions like an antecedent-pronoun relationship. The antecedent is "in the USA" and the pronoun is "in this country." Hope this helps!