When was the greatest decline of imports from great britain to the colonies? why?

1774-1776 why because the intolerable acts  was coming into effect due to the boston tea party if that makes any sense if not let me know ill explain more 

The social difference that caused sectionalism in the antebellum era would be c.)  north was disorganized. the north had slow population growth, where as the south had mass immigration.hope this really mark