In many ways racism was still prominent within the United States after the civil war. Many laws were set in place to keep African Americans below white Americans. These were known as the Jim Crow laws. Even after the Jim Crow laws were removed segregation and civil rights issues were common until the 1960’s.
By the 1700's Austria and Spain were in conflict with each other over territory in Italy.
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Because of imperialism, countries now had access to colonies. When the war started, they were able to equip their colonies to fight for their side. This led to higher tensions and increased involvement in the war.