The Mexican people felt driven to rebellion to overthrow Diaz dictatorship and to those politicians who constantly shifting alliances that result to major economic and social turmoil.
Moreover, the revolution was a success for they achieve a good guideline of Mexican policies and the people has developed a sense of purpose and identity.
The answer to your question is:
They feared a growing Soviet influence in the region.
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They look for B and C mostly B
A. abstract
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