Disadvantages, I believe, but am not sure are factual, were with a strong executive branch, the people feared that the president would manipulate his powers, just like the king of England had done so with the colonies and those who disagreed with it thought that the smaller sates wouldn't be voiced.
D Voting Rights Act because it was signed into law by President Lyndon B. Johnson, aimed to overcome legal barriers at the state and local levels that prevented African Americans from exercising their right to vote as guaranteed under the 15th Amendment to the U.S. Constitution.