It was deeply involved due to Cuba being around 90 miles off of the coast of Florida, if nukes were on the island, the range could reach almost all of Mainland America. Also, President Kennedy of the USA had told Premier Khrushchev that Soviet nukes are not allowed on the Island of Cuba.
The annexation of Texas, a slave state, raised a lot of tension because it ruined the balance of power between the North free states and the South slave states.
The effect that the Mexican Revolution had on other Latin American nations was that Mexican Nationalism inspired similar economic and political reforms in other countries.