Answer:
Copper:
Copper compounds produce blue colors in fireworks. Although Copper has a red appearance in solid form, when it’s set alight it creates stunning blue fireworks. Copper is used in electrical wire and roughly half of all copper mined is used for this purpose.
Stratify means to divide into parts, and unequal parts, such that there is a hierarchy between people.
One of the ways that the American people are stratified is financially: the richest people can have control over the poorer people. This is often connected to politics: the richest people have more political power.
Another way is through education: the more educated people can have more power than the less educated ones.
I believe they were called Founders.