Which of these belongs in the empty box?

electing a president
national power versus states' rights
slaves used to determine representation
taxation of exports

Slaves used to determine representation

Explanation:

Fractions can be complicated. The Three-Fifths Compromise solved the problem of determining population for representation in the new government. Under the compromise, Southern states could count three out of every five slaves towards population.

1.a)britain

2.b)spain

3.c)french

4.d)portugal

explanation:

seeing as no choices were provided, i'll do my best to answer it from knowledge.

job specialization promotes work ethic to the person doing the job. he/she may be strong in the arms and able to lift things, specializing him/her in a job where you lift and carry.