The trend on this chart after 1776 can be attributed to

Responses

Aa lack of importing and exporting goods.
a lack of importing and exporting goods.
Ba lack of foreign conflict in North America.
a lack of foreign conflict in North America.
Ctight economic control by the early U.S. government
tight economic control by the early U.S. government
Dloose economic control by the early U.S. government.

Dloose economic control by the early U.S. government.