Why was the cleveland massacre significant in the formation of standard oil?

It was actually Standard Oil that was significant in the formation of the Cleveland Massacre in the late 1870s. John D. Rockefeller's company called Standard Oil held a monopoly on the oil traffic in and out of Cleveland until the Supreme Court ruled it had to be split up in 1911.

Standard Oil became a monopoly in the Cleveland oil market after the Massacre.

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The American's Creed

Explanation:

The American's Creed was written by Thomas Jefferson during World War 1 and it was meant to stimulate and influence the Americans to remain devoted and faithful to their country. This written creed promotes freedom, individual participation, equality and fairness.

This belief was also expressed in the Declaration of Independence that "just powers are derived from the consent of the governed".