What event began the mexican revolution?
a.
pancho villa recruited thousands of people to oppose huerta.
b.
victoriano huerta killed francisco madera by having him shot.
c.
president wilson sent 6,000 troops to pursue villa across mexico.
d.
revolutionaries replaced dictator porfirio díaz with a progressive reformer.

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it proved indian land claims were unjustified.

a causal relation between two events exists if the occurrence of the first causes the other. the first event is called the cause and the second event is called the effect. a correlation between two variables does not imply causation.

explanation: