The correct answer for this question would be the POPULATION. The states would dispute each other claims to western territories because of population. It is the key factor for this dispute because it means control in a democracy. Hope this is the answer that you are looking for.
Italians for all smuggling, guntrade, alcohol trade, rackets etc
Asians 'cause of the conflict with Japan in World War 2 eg: Pearl Harbour, Hiroshima/Nagasaki nukes.
Spanish. America have always hated the spanish.
Russians due to the clash of left/right wing politics.
The answer is A, many scientists the Renaissance were Humanist because they studied what people did before them and tried to make sure it was right by doing trials that gave them evidence.
opinion
you can't prove that pigs don't make good pets, its totally subjective