Cahokia was one of the largest and possibly the capital city of the people that are referred to as the Mound Builders. Cahokia's size and the large number of people that lived there led to the main issues. Bad droughts and poor harvests meant people couldn't eat.
In 1917, Bolshevik leader in Russia sought peace with German because the new Russian government -wanted to retain power and avoid German occupation-
Answer is.... to help new States join the Union!! (Gradpoint)
1. The Spanish isolated Cuba and stopped their sugar growth.
2. (Most likely) sank the U.S.S. Maine
3. Insulted the ways of President McKinley.