Why do you think some groups are highlighted and others are mostly ingored?

Depends on the subject, but some are highlight due to having back up evidence for their importance. Those groups that are ignored don't usually offer enough good claim to back themselves up on what they support.

Hopefully this is the kind of answer you needed.

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.