How did Rockefeller and the Standard Oil Company get around laws that forbade companies in one state from underselling or doing business in other state?

They developed the idea of creating trusts.

answer; /// the correct answer is evidence of the olmec civilization has been found in southern american in a hot steamy forest, archaeologists have found earthen artifacts at several sites that were evidence of the olmec civilization. these   artifacts were mounds,courtyards and pyramids build of stones, also on top of the mounds were many monuments made of stone, some of these stone structures are very large, they weigh as much as 44

because mexico wanted to choose a centralized location