Answer: as a century progressed, suburbs drained people and their resources from the city.
Explanation:
Assuming this is about the triple alliance that was created prior to the First World War, then it would be the Central Powers which would be Italy, Germany, and Austria. Not sure what ya put there.
The reasons why Christopher Columbus explored because he wants money and to discover something new also to prove the king and queen that there is new land to explore
They wanted to have change