5. How did the Aztecs prevent flooding in Tenochtitlan?

They dug irrigation canals

Explanation:

Tenochtitlan was the capital city and center of the Aztec Empire. The city founded in 1325 and served as the center until it conquered by Spanish in 1520. The city was built on a swampy island in Lake Texcoco with pyramids, palaces, and storehouses. The Aztecs were able to settle there where the water served as a natural defense from enemies. The Aztecs build aqueducts, canals, and responsible for the development of a hydroponic form of irrigation. Hydrological had gates to control the flow of water from the lakes during the seasonal raining.  

a phrase from a poem by ralph waldo emerson about the battle of lexington and concord. emerson's words read, “here once the embattled farmers stood / and fired the shot heard round the world.”

napoleon the third became a empire in 1873 also known as the era of the franco-prussian war.