The fact that the President of the United States is being investigated by the FBI right now, after betraying our country and very probably working with a foreign state to undermine our democracy shows that our system works. The fact that the Speaker of the House is not running for reelection with the writing on the wall saying he complicit the Republican party was in undermining our democracy shows that our system works.
There are issues with our system, the electoral college is a relic of slavery and African Americans are disproportionately targeted by our judicial system. But the fact that the president of the United States is being taken down by the FBI shows that our system is strong.