Short form: the English Civil War was a series of civil wars and political machinations between Royalists and Parliamentarians in the Kingdom of England from 1642 to 1651. To put it in US terms: those who wanted power in the Executive vs those who wanted a popular voice. It was even more radical in France, but the US is closer to England than the continent in its political nature.
According to this video, project 2025 seeks to make the executive branch
the more powerful one.
That would make the president basically an official greeter.