How did the constitution uphold the rights of the states while strengthening the national government?

The federal government was strengthened with the creation of the position of the President, which acts at the executive branch of the government. This was a power that was absent from the Articles of Confederation. At the same time, the Constitution endowed the states with the power to govern their own territory by creating laws of their own, as long as they do not contradict the federal law, and most importantly, gave the citizens within the states the right to cast ballots and vote.