A : The demand for slaves increases in the south. B : more textile factories are established in the south
C : the number of European immigrants arriving at southern port cities increases
D : more tobacco and food crops are cultivated on southern plantations.

B is the answer.

Explanation:

Because all of these lead up to industrialization.  

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.