Bolesław The First, aka Bolesław The Great. 
Thanks so much for your question! Don't forget to rate and give me the brainliest answer! Then, I can help you with all your problems! ^-^ ~
        
                    
             
        
        
        
Answer:
1
Explanation:
and that's it so yeah.. I hope you have to help with this..
 
        
             
        
        
        
Answer:
a because there was the California gold rush
 
        
             
        
        
        
I think throughout the 1920s.