Maybe you could cut together a series of movement selects (you know, the arrows that move towards a province), and as the arrows hit the province on the map there could be an effect that makes it look like the map cracks.
The music and sound were picked well, but you might want to consider removing that homemade laugh at the end. Considering the tension you're trying to build it's best not to have it end with something that makes it sound like it was all a joke
I can't tell how much effort you put into it of course, so I might be suggesting things too hard to do...