C..............................................................................................
Answer:
A divided regional identity (with a bit of national unity) developed.
Explanation:
Politics: Some contributed (voting rights) to unity, others (nullification) clearly divided the country.
Economics: Market revolution was a bit of both but Tariffs and the clash between the industrial north and the agricultural south was dividing the country and contributed to a regional identity.
Foreign Policy: The war of 1812 united the country; the westward expansion was uniting and dividing at the same time.
As we take in account that Economics is always the most important thing for the general public, the regional identity grew more than the national unity did.
Because of increasing sea ice.
In climate change taking place since then, there has been an opposite problem. Beginning in the late 19th century, a reduction of sea ice has been progressing in the Arctic regions. The pace of ice mass loss has been accelerating especially since the 1970s. In the first decade of the 21st century, Greenland's ice loss accelerated at a rate of 30 gigatonnes a year.
Answer: Aaron Ogden was at the case