Why did Roman people joined Hannibal and his armies?

Hasdrubal, recognizing that Spain was a lost cause, crossed the Alps to join Hannibal in Italy for a united attack on Rome. At the Battle of the Metaurus River in 207 BCE, however, Hasdrubal's army was defeated by the Romans under Gaius Claudius Nero (c. 237-199 BCE); Hasdrubal was killed and his forces scattered.

Explanation:

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world war i had a devastating effect on german-americans and their cultural heritage. up until that point   german-americans, as a group, had been spared much of the discrimination, abuse, rejection, collective mistrust experienced by so many different racial and ethnic groups in the history of the united states. indeed, over the years, they had been viewed as a well integrated and esteemed part of american society. all of this change with the outbreak of war.