What major changes took place from 1820 to 1850 were these good changes or bad for the U. S why?

wood carving remains today the primary sculptural art form of the sub saharan continent. african art history shows the earliest wooden sculptures from the 17th c are attributed to the kuba, central zaire but the earliest surviving sub-saharan sculpture is a zoomorphic head found in 1928 in central angola.

i hope this .

from the conditions of the working class in england by friedrich engels,the main idea is :