Answer: railroads were built with assistance from the federal government through land grants.
Explanation:
 
        
             
        
        
        
Slowed technological progress.
        
                    
             
        
        
        
Explanation:
30 for the spark or cheaper at auto places 
air filter should be around 20 to 15
 
        
                    
             
        
        
        
Answer:
federal: sets ages for smoking and drinking
local: maintains schools and recreational spaces
state: enters into agreements with foreign nations
Explanation:
hope it helps