What are the differences between Romans and Jews?

This is actually not as silly a question as it might sound at first.

A “Roman” was anyone granted Roman citizenship—much as an “American” today is anyone granted American citizenship. Many foreigners (which, as far as native Romans were concerned, included all Italians not from Rome or its surrounding Latin region, as well as those from far off lands) were granted this cherished status, as a reward for service or for some other worthy merit.