The main issue that led to the Great Compromise was the issue of representation. The small states in the country thought that every state should have equal representation in the Congress. They thought the states ought to be equal to one another.
No i personally don't think that canada should cut ties with the queen
The Electoral College should remain the same for various reasons. First, if it were not for the Electoral College, large states, such as California, would largely control the nation. The Electoral College is designed to maximize states' rights. For example, if the U.S. were a direct democracy, Hillary Clinton would have been elected as our president, even though approximately 90% states supported Trump. With the Electoral College, each state has 2-3 Electors for each Political Party. If the majority of the state votes for Hillary, the democratic electors for that specific state get the vote. If the majority of the state votes for Trump, the Republican electors get the vote. The system is designed to maximize sates' rights and avoid impulsive, mass decisions.