What percentage of a state’s slaves be counted as part of population

a slave was considered to be 3/5 of a person.

Explanation:

slaves weren't counted as people, or as property. It was a 3/5 comprimise. 3/5 of the slave was considered person, and 2/5 was considered property

increase in population

after defeating german forces in north africa allied leaders turned their attention to "italy," since this was the location that made the most geographic sense before invading northern europe via france.