Why is Crispus Attucks not a household name in American History next to other important figures that we typically cover?

Probably because he doesn't have a defined ethnicity.

Explanation:

Crispus Attucks is considered the first American killed during the American revolution. He was a great defender of the country's independence and was directly opposed to British rule in American lands. In addition, he was a strong opponent of slavery, becoming a symbol of the anti-slavery movement and the defense of black rights.

He was of African descent and Native American, which meant that he did not have a defined ethnicity. The documents and reports about his death, leave his ethnicity even more confused, where he is not reported as black or as a non-black, not even as a Native American, but as a mulatto.

In our society there is a tendency to exalt only the struggle of white men in relation to revolutionary movements. This causes women, blacks, Indians and foreigners who were influential in these causes to be forgotten and not considered great symbols of the movements that built our country. Because he was mestizo, Attucks fit into several of these categories, which meant that his struggle and goal in this nation, has been devalued and forgotten over time, making him not be considered a known name in American history alongside others important figures.

i would go with the last one

the answer to your question is

the treaty of hopewell