Native Americans - Crossword

Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.
1       2                 
                    
     3                 
 4                     
5     6       7    8      9        
                    
     10                 
          11            
                    
         12    13           
  14    15           16         
                    
      17                
   18                   
                    
         19             
                    
     20