Inputing accentuated characters form wcin

Question

I need to write a C++ that reads country names in Portuguese (Latin language with special characters like é and á)

This is the code I am using:

int main(int, const char *[])
{
    setlocale(LC_ALL, "en_US.UTF-8");
    locale accents("en_US.UTF-8");
    wcout.imbue(accents);
    
    wstring belgium, italy;
    
    belgium = L"bélgica"; italy = L"itália";
    wcout << L"Result: " << setw(15) << belgium << endl;
    wcout << L"Result: " << setw(15) << italy << endl;
    wcout << L"Result: " << setw(15) << L"portugal" << endl << endl;
    
    wcout << L"Input 'bélgica itália': "; wcin >> belgium >> italy;
    wcout << L"Result: " << setw(15) << belgium << endl;
    wcout << L"Result: " << setw(15) << italy << endl;
    wcout << L"Result: " << setw(15) << L"portugal" << endl;
}

And this is the result I get:

Result:         bélgica
Result:          itália
Result:        portugal

Input 'bélgica itália': bélgica itália
Result:        bélgica
Result:         itália
Result:        portugal

So, you can see on the first part of the code, I attribute the values L"bélgica" to variable belgium and L"itália" to italy. When I display the variables' contents, everything is perfect: accents come out right and setw does its job properly understanding that "é" and "á" are a single character, so both countries' names come aligned with "portugal".

The second part of the code is what is bugging me: I now use wcin to get the values of variables belgium and italy, but the results are not as I expected.

Can you help me, please?