What were two most common reason for changes of leadership during the third century

In what two ways were the tang and song dynasties of china similar? they jointly built the grand canal. they were economically strong. they had weak military forces. they ruled for about 300 years. they discouraged buddhist ideas.

The majority of victories and progress made by the women’s suffrage movement in the late 19th and early 20th centuries came from the industrialized north the denizens of the east the american west the reconstructed south

Which statement best explains how the invention of corporations contributed to the economy in the 1800's