The investiture struggle in the holy roman empire led to the calling of the crusades weakened the power of its emperors unified the empire under a strong ruler caused the protestant reformation

The investiture struggle in the holy roman empire  weakened the power of its emperors due to fact that holy roman emperors wnated to end with separation of secular and religious authroity and have authority over the church simila to yzantine system of ceasaropapism

In my honest opinion , i’d say franklin d roosevelt was a president that impacted our nation , i say this because fdr is voted among top three best us presidents and he was the longest serving president by 3 terms , usually presidents only supposed to have two terms increments of 4 years , equivalent to 8 years total before election time. and he established the fdic , through the 1933 banking act and he established the us , social security system , during his presidency, and established a national minimum wage , through the fair labor standards act , fdr led the allied coalition to victory in wwii and he played a major role in the creation of the united nations.