1. J. Edgar Hoover kept power by (a) keeping personal files on prominent politicians, (b) trying to keep the FBI in the public's eye, (c) courting presidents, (d) all of these. 2. A former State Department employee who was a Communist, and whose investigation helped the career of Richard Nixon, was (a) Whittaker Chambers, (b) Klaus Fuchs, (c) Alger Hiss, (d) Julius Rosenberg.

comparative method

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while it was true that the cotton gin reduced the labor of removing seeds, it did not reduce the need for slaves to grow and pick the cotton.

explanation:

before eli whitney's invention of the cotton gin, picking and cleaning cotton was a slow, labor-intensive job. workers, usually slaves, had to pick the seeds from the cotton fibers by hand. this invention made it possible to grow large amounts of cotton on big farms and make money.

the answer is c. to explore the louisiana purchase