Why was Columbus upset with the out come of his four voyages to the Americas?

Columbus was disappointed with the outcomes of his four voyages primarily because he did not find the wealth and resources he had anticipated, such as gold and spices. Despite claiming new territories for Spain, he faced criticism for his governance and treatment of indigenous populations. Additionally, he struggled to gain recognition and support from the Spanish crown, which led to his eventual fall from favor and diminished legacy. Ultimately, Columbus's aspirations for glory and riches remained largely unfulfilled.