During the nineteenth century,________ was America's dominant institution of government.

A) the presidency
B) the Supreme Court
C) Congress
D) the executive bureaucracy

During the nineteenth century, Congress was the dominant institution of government in America. This was due to various factors such as the increased power of political parties, the expansion of voting rights, and the growth of the federal government's responsibilities. Congress was responsible for passing legislation, controlling appropriations, and conducting investigations, which gave it significant power and influence over the other branches of government. While the presidency and the Supreme Court also played important roles, they were not as dominant as Congress during this time period.