I think the leading cause of water scarcity is too much usage, pollution, and global warming. These might be a few things but these are mostly the things that have the most effect on water scarcity.
Hope this helps
The right answer is A n E
Answer:
introduction of European diseases to which native peoples were not resistant
Explanation:
The native people of Mexico and New Spain far outnumbered the Spanish colonial masters. However, certain European diseases such as Smallpox, influenza, mumps, measles were introduced and the native people had no resistance to them.
Since the people had no resistance to these diseases, their population was easily decimated, giving the Spanish an upper hand.
