Why is the u.s. population considered a "salad bowl" of homogeneity? because groups have mixed together but have maintained their diversity by retaining cultural differences because most groups are shedding their ethnic culture and shifting towards a unified american culture because cultural differences have not been assimilated even though a mix in ethnicities has been traced in the population because different ethnic groups have mixed together in america and lost their original identity, diversity, and cultural nuances because ethnic and cultural differences have been retained by a lack of mixing between different ethnic groups?

because groups have mixed together but have maintained their diversity by retaining cultural differences.
In 2017 alone, almost 15% of American population were immigrants that came from various country.
When these immigrants came, a cultural difussion between the new and old cultures happened and form a diverse population just like what we see in a salad bowl.

When Paul Revere first began selling his color prints of "The Bloody Massacre perpetrated in King Street" in Boston, he was doing what any like-minded patriot with his talents in 1770 would have done. Only, Paul Revere did it faster and more expeditiously than anyone else, including two other artist-engravers who also issued prints of the Massacre that year.

Twenty-one days before — on the night of March 5, 1770 — five men had been shot to death in Boston town by British soldiers. Precipitating the event known as the Boston Massacre was a mob of men and boys taunting a sentry standing guard at the city's customs house. When other British soldiers came to the sentry's support, a free-for-all ensued and shots were fired into the crowd.

Four died on the spot and a fifth died after four days. Six others were wounded.

The presence of British troops in Boston had long been a sore point among Boston's radical politicians. Paul Revere wasted no time in capitalizing on the Massacre to highlight British tyranny and stir up anti-British sentiment among his fellow colonists. As you will see, Revere's historic engraving is long on political propaganda and short on accuracy or aesthetics.