Final answer:
Thomas Putnam's main motivation for accusing people of witchcraft, as suggested by Giles Corey, was to acquire land and increase his wealth during the Salem Witch Trials.
Step-by-step explanation:
Giles Corey suggests that Thomas Putnam's main motivation for accusing people of witchcraft is the acquisition of land. During the Salem Witch Trials, it's implied that Putnam took advantage of the hysteria to increase his wealth and holdings by accusing those whose property he could then claim. This perspective is depicted in Arthur Miller's play, 'The Crucible,' which dramatizes the events of the 1692 witchcraft scare in Salem Village, conveying the interplay of personal vendettas, mass hysteria, and social dynamics that fueled the accusations and subsequent trials.