The American colonies differ from other colonies in the British empire because of diverse cultures, ect.
Simon Bolivar was a revolutionary, born in Venezuela, who liberated 6 countries in northern South America from Spanish forces sent by the then king of Spain, Bolivar traveled to Europe to ask Spain to withdraw its military forces from America, stop repressing the people and taking advantage of their wealth, but they ignored him, then he returned to South America from where he undertook a battle to free the countries, achieving the objetives and winning almost all of the fights.
The liberals did not want an elected parliament.
Answer: It was added to the Constitution to protect Americans from the government from having too much power/unlimited power.