The correct answer is the Civil War
When Lincoln was reelected the country was engulfed in the Civil War and Lincoln was reelected based on the idea that he would help end the war which indeed did happen soon after his reelection. At the same time however, he was assassinated just 2 months into his second term so Andrew Johnson became the president.
The Population Registration Act determined people's race classification, which in turn determined the implementation of many other racially based laws. One of the apartheid laws passed in the 1950s was the Group Areas Act, which determined where people of different racial groups could live.
Farm animals gave the disease to European farmers, and they gave it to the Native Americans.
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