What immediate need led to and invention in 1838 by john deere

i think it is a system for harvesting crops more easily

nativists tried to get rid of the immigrants as they thought they were going to ruin the u.s.  

the navigation act prevented the colonies from exporting to countries other than britain and it prevented the importation of goods by other countries as well. so i believe the correct answer is d. other nations could not deliver goods to the colonies.

hope this .