The best and most correct answer among the choices provided by the question is the second choice "He let his party campaign for him."
In 1860<span>, </span>Lincoln<span> won the party's </span>presidential<span> nomination. In the November </span>1860 election<span>, </span>Lincoln<span> again faced Douglas, who represented the Northern faction of a heavily divided Democratic Party, as well as Breckinridge and Bell.</span>
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C, Christianity good luck
Minorities have become quicker than the white population.
This has been true in the United States since the 1960s.
Vietnam War is definitely one I'm not sure about the other two though
Global warming
Population increase
Resources depletion