Answer would be the withdrawal of federal troops from the South.
Fog, the other three options would be too high in the atmosphere to cause visibility problems.
Before the election of 1912, there were actually two major parties that fought the elections. There were also a few small parties in thiose elections that were quiet insignificant. before the 1912 elections, the Republican party split into two parts and one of the section named it the Progressive party. They both carried certain amount of votes. This splitting actually helped the Democrats. Although at that time the Democrats did not have any chance of winning the presidential elections, but the splitting of the Republican Party helped them to win the election of 1912.
Explanation:
The rise in economic nationalism undermines the tradition of economic liberalism (globalism) and discourages economic and political cooperation between countries. ... Countries benefit with cooperation between countries to mutual benefit, becoming too nationalistic at the expense of its partners is counterproductive.
