What does domino theory mean as it applies to vietnam war

Definition of domino theory 1 : a theory that if one nation becomes Communist-controlled the neighboring nations will also become Communist-controlled 2 : the theory that if one act or event is allowed to take place a series of similar acts or events will follow

answer; the period of time known as the middle ages;

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.