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I want to convert a French Canadian Macbook Pro, Mid 2015, 15” to a US keyboard. I think I will need a keyboard and a top case. Is this correct? Can you please direct me to the correct top case?

The first question you have to ask your self is the cost of replacing the uppercase worth it as well as your desire to hold onto your system. While one can replace the uppercase assembly Apple P/N 661-02536 for the US version it can be quite costly if its the one that has more than just a keyboard (has the trackpad and battery) which also comes with the assembly ~ $450 USD. You might be able to find a recycled unit for less for around $300 USD. Your last option (which is the cheapest and in my mind the easiest) is just replacing the keycaps as needed and using the proper keyboard layout in your keyboard control panel.