Whose political victory was a major loss for the Populist movement?

Based on this graph, it is reasonable to assume that by 1930 the percentage of the population with the right to vote was

What would lead a historian to consider two events to have a relationship of correlation rather than causation

Why did the united states become involved in the soviet-afghan war? the united states wanted access to the afghan oil fields. the united states wanted to retaliate against the soviet boycott of the 1984 olympics in los angeles. representative charlie wilson convinced congress to fund afghan resistance to soviet influence. president ronald reagan wanted to force the soviets to withdraw from afghanistan.