Why does Americans need a parliament?

Americans do not have a parliament because their government is structured as a federal republic with a bicameral legislature, consisting of the House of Representatives and the Senate. This system is designed to balance representation between populous states and less populous ones, ensuring diverse interests are considered. While a parliamentary system might promote more cohesive party governance, the current framework allows for checks and balances that prevent any single entity from gaining excessive power. Ultimately, the U.S. system reflects its unique historical context and values of individualism and separation of powers.