I did not understand.
I used to merge together the shapes of each country. And then redesign only once.
I do not know if I'm right, but if a polygon have an overlap with another polygon, the merge function creates a new internal polygon to these two areas. So, if shape of the United States has an overlap with the Canada, the merge function will create a new polygon, as if there were another country that does not exist. Is that right?
My premise is that this does not happen because the shapes and geodabases are the same source.
If I use dissolves me I will not lose internal polygons?