What kept the soil of the chinampas from oozing into the network canals? What anchored each chinampas plot to the solid ground beneath the water level?

The roots of the plants on the chinampas held the soil together. Willow trees were planted at the corners and along side the beds. Their root system anchored the bed to the shallow lake.

Explanation:

can you give a picture of the map, i'll be able to update my answer!

explanation:

with the profits from the european sales, merchants purchased europe's manufactured  goods, including tools and weapons. then the merchants shipped those manufactured  goods, along with the  american  sugar and rum, to west africa where they were bartered for  slaves.