The answer to that question is 23, to be exact. Of those 23 countries that divide up the continent, Canada, and the United States comprise nearly 80% of the total land area. 
I really hope this reply serves as a complete answer and is exactly what you were looking for.
~Brooke❤️
        
             
        
        
        
<span>One significant difference between oceanic and continental crust in terms of the long term evolution of the earth's surface is that in rhwew onwq</span>