Answer:
President Johnson ordered the stationing of warships off the Dominican coast and the intervention of US troops in the Dominican Republic in 1965 to prevent a perceived communist threat and to stabilize the political situation in the country. In Chile, it was President Nixon who ordered the CIA to engineer a truck drivers' strike in 1972 to put pressure on the government of President Salvador Allende, who had been democratically elected and was seen as a socialist and a potential threat to US interests in the region.
In the case of the Dominican Republic, Johnson was concerned about the possible establishment of a communist government in the country following a military coup that had overthrown the democratically elected president. Johnson believed that such a government could have implications for US national security interests in the Caribbean region. The intervention of US troops in the Dominican Republic was intended to prevent the establishment of a communist government and to stabilize the situation in the country.
In the case of Chile, the Nixon administration was concerned about the election of President Allende, who was seen as a socialist and a potential threat to US economic interests in the region. The truck drivers' strike was one of several covert operations carried out by the CIA to undermine Allende's government and to create instability in the country. The goal of the Nixon administration was to remove Allende from power and to replace him with a more pro-US government. Ultimately, this strategy led to the military coup in Chile in 1973, which resulted in the installation of a right-wing military dictatorship that was supported by the US government.
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