The mobility of the colonist forced colonial governments to be a liberal because the colonist were always on the move and they wanted to please the colonist that were coming in and have an open mind. The first colleges found it in the American colonies were bite we're by England men OK British men so that is how that happened and the factors that made public education important and most of new England colonies is that they wanted people to know their stuff and be educated..
Both nations did not want to fight directly because of the threat of a nuclear Holocaust, They were the most powerful nations that spread influence and dominance to surrounding countries and fighting them directly would have started another World war.
I do not know the answer, but if I were to guess, that it would be the one about plantations.
Plantations were hotspots of manual labor, specifically slaves. And when slaves were outlawed the plantation owners lose there main source of “profit” (aka the need to not pay workers for manual labor and instead use that money to get more laborers) it seems like the logical answer to me.
Also using process of elimination we know that the war could have spilt the country in two. So the union was indeed saved.
Islamic ruler so successor