Answer:
too much foreign emigration
Explanation:
All of the following factors contributed to the collapse of the Roman republic except breakdown of the military.
I think the answer is anarchy
The number of delegates at the constitutional convention are 55 <span />
It's a leading question, as cross-Atlantic trips carrying slaves would be European of all kinds. Though vikings usually enslaved people from the Baltic area but had slaves (thralls, in Danish; "trælle") from just about everywhere.
The Dutch and Belgians were far nastier than most nords, as at some point the Spanish and the Germans. Not to mention the old empire of the queen.