Read the passage about dr. john snow. in 1849, doctor john snow began to question the long-held beliefs that disease was caused by “bad air.” when a cholera epidemic broke out in london, he interviewed residents of the hardest-hit areas. he mapped cases of the disease and determined that they were centered around a particular water pump. to test his theory that contaminated water was to blame, he convinced local leaders to disable the pump by removing the pump’s handle. the outbreak came to an end. what was dr. snow’s hypothesis? cholera was caused by “bad air.” cases were centered around a water pump. contaminated water caused cholera. leaders should disable the water pump.

Which is the best example of a primary source ducument useful in the study of history ?

Excerpt from w. e. b. du bois jon reese 4 du bois was one of the first male civil rights leaders to recognize the problems of gender discrimination. he was among the first men to understand the unique problems of black women, and to value their contributions. he supported the women's suffrage movement and strove to integrate this mostly white struggle. he encouraged many black female writers, artists, poets, and novelists, featuring their works in his crisis magazine and sometimes providing personal financial assistance to them. the cause was that w. e.b. du bois encouraged many black female writers, artists, poets, and novelists. what was the result? think about cause-and-effect relationships.

Which is the correct order for events that eventually led to the collapse of the chinese imperial government