What was the process that made this material cheaper and better?

d

explanation:

i think that this is the best answer, but im sorry if this is wrong

4 copper and gold, the california gold rush is why im pretty sure.

north atlantic treaty organization.

lancelot said to the beautiful ellen i c u r a b u t l n (i see you are a beauty lancelot was the greatest and worst of the knights who became the king's champion and undertook quests in the king's name. he became the adulterous lover of queen guinevere, and they had a son named galahad.