What is the name of the system established to make sure that each branch of government can prevent the other branches from getting too much power?

In 1958, the aarp was organized to promote

The georgia platform showed that most georgians ~accepted the compromise of 1850 and wanted to stay in the union. ~rejected the idea that compromise was necessary to maintain the union. ~accepted the idea that slavery was evil and must be ended. ~hoped the compromise of 1850 would break the union apart.

Describe the technology advancements that lead to explorers being able to sail great distances. [[ps: doesn't explain where. i am only speculating it's in europe.