It could be due to various reasons. Maybe the plot wasn't engaging enough, or there were production issues. Also, sometimes changes in the network's programming strategy can lead to a novela being pulled.
Well, 'Hidalgo' has roots in true events, but it's not a strict, 100% accurate retelling. Some aspects have been fictionalized or enhanced to create a compelling film.
It's hard to say for sure. Some parts of the Hidalgo story might be based on real events or people, but it's likely that there's also a fair amount of fictionalization and embellishment.
Well, the Dominguez might have a civil war story. Think about it. During a civil war, no place is completely untouched. The Dominguez, depending on its location and the people there, could have been a site of battles, or at least a place where the after - effects of the civil war were felt. Maybe there were people from Dominguez who fought on different sides of the war, or perhaps it was a refuge for those fleeing the fighting. There could be a whole range of stories, from the economic impact on the local community to the personal stories of the individuals who lived through those difficult times.
No. As far as I know, the Dominguez family has no connection to any civil war story. They have always been more focused on their local business and family affairs.