What creates the differences between those two countries?
I wonder what it is that leads to so many differences between those two nations?
ーWhat creates the differences between those two countries?
「何が2カ国間の違いを生み出しているのでしょうか？」
What creates the differences? で「何が違いを生み出しているのですか？」
between those two countries で「2カ国の間で（に）」
country「国・国家」
ーI wonder what it is that leads to so many differences between those two nations?
「何がその2カ国に多くの違いをもたらすのだろうか。」
I wonder what ... で「何が…なのだろう・だろうか」
lead で「もたらす」
nation で「国・国家」
ご参考まで！
カナダ 
