How is the American president limited in his power to act as he pleases?

The American president is limited in power by the system of checks and balances established in the Constitution, which distributes authority among the three branches of government: the executive, legislative, and judicial. Congress holds the power to enact laws, control funding, and can override presidential vetoes, while the judiciary can review and invalidate executive actions deemed unconstitutional. Additionally, the president is subject to public opinion, political pressures, and the need for bipartisan support to effectively implement policies. These mechanisms ensure that the president cannot act unilaterally without accountability or oversight.