Not going to read the whole thread... will just respond to the OP.
You have clearly defined "liberal" vs. "conservative" based on the U.S. political spectrum's definition of liberal and conservative issues. The two political parties have naturally balanced out close to 50/50 in vote share, as one will move further left/right to capture share from the other if there is an imbalance. The issues will be redefined as liberal or conservative based on where the new balance is found
in your country. The new balance will not be defined by issues already deemed liberal/conservative by any international standard.
The U.S isn't balanced left/right by any international spectrum of developed countries. It is balanced far-right/slightly-right. The Democratic Party occupies much of the same territory as the Conservative Party in Canada. There simply isn't a centre-left party in the U.S. Also, on economic issues, the centre-left NDP in Canda would be middle of the road in most of Europe.
Makes you wonder why there is so much scare-mongering about "socialism" when most European countries successfully govern at the extreme economic left of Canada's major political parties.
By international standards, I am a centrist.