What was the main reason why americans continued to move the frontier in the 1800s? they wanted to exploit fertile farmlands. they wanted to live in the mountains. they wanted to settle along the east coast. they wanted to move away from the big cities.

The main reason why Americans continued to move the frontier in the 1800s was that they wanted to exploit fertile farmlands. Option A is correct.

American frontier, in United States of America history refers to the advancing border that framed the territory made up  of lands that had been settled by Europeans. It is characterized by the westward movement of European settlers from the original Atlantic coast (17th century) to the Far West (19th century).

why was the national assembly formed by the third estate?

the estates-general had not been assembled since 1614, and its deputies drew up long lists of grievances and called for sweeping political and social reforms. the third estate, which had the most representatives, declared itself the national assembly and took an oath to force a new constitution on the king.

the answer is migration