The lack of water can cause disease , some wildlife can start dieing they dont have enough water to survive. This can also cause fires due to the ground over-heating with nothing to cool it down.
When you have a drought you have little water so that effects the enviorment. Also,it effects the growth of crops and forest productivty it is very hard for animals to get the water they need while in a drought.
The Western part of the United States is most affected from droughts do to its hot climate.
Plants are mostly effected by droughts which means pretty much everything is messed up becayse its like a food chain that depends on the plants for most of its supply.