How is the sovereignty of a nation-state limited

Which of the following is an example of imperialism

Which situation would be considered an example of the freedom of association? a. three students write a letter to a local newspaper demanding that a teacher be fired. b. a group forms on a college campus to support a particular political candidate. c. an individual purchases a membership to a local gym. d. a religious organization buys several local lots in order to construct a new church building.

What former head of the cuban secret service was charged with protecting the country's prime minister for nearly 50 years?