Dynamic Structs in C++

Dynamic Structs in C++

For a project in C++ (I'm relatively new to this language) I want to
create a structure which stores a given word and a count for multiple
classes. E.g.:
struct Word
{
string word;
int usaCount = 0;
int canadaCount = 0;
int germanyCount = 0;
int ukCount = 0;
}
In this example I used 4 classes of countries. In fact there are hundreds
of country classes.
My questions regarding this are the following:
Is there any way to generate this list of countries dynamically? (E.g.
there is a file of countries which is read and on that basis this struct
is generated)
Fitting for this struct should be a function which increments the count if
the class is seen. Is there also a way to make this "dynamic" by which I
mean that I want to avoid one function per class (e.G.: incUsa(),
incCanada(), incGermany() etc.)
Since I'm not really used to C++: Is this even the ideomatic approach to
it? Perhaps there's a better data structructure or an alternative (and
more fitting) way to result the problem.
Thanks in advance.