Why did the ancient chinese organize large groups of people to build and maintain irrigation systems?

What do historians call the political,social,or cultural circumstances surrounding an event?

What event from world war l does the image most likely depict

Read this list: a. it was established by president barack obama. b. it makes it easier for all americans to access health care. c. it was part of the great society. d. it was part of the new deal. e. it provided a guaranteed income to poor americans. which options are characteristics of the affordable care act?