At issue was who, the pope or monarchs, had the authority to appoint (invest) local church officials such as bishops of cities and abbots of monasteries. The conflict ended in 1122, when Emperor Henry V and Pope Calixtus II agreed on the Concordat of Worms. It differentiated between the royal and spiritual powers and gave the emperors a limited role in selecting bishops.
The first two US political parties were technically the Federalists and the Anti-Federalists, who were later known as the Democratic and Republican parties.
The form of government in the U.S.A. has been an issue of argument ever since the signing of the Constitution. The first two political parties in the U.S. were formed to identify the two sets of political opponents regarding the form of government.