President Donald Trump painted a grim and divisive portrait of the state of American education on Thursday, claiming that anything from elementary schools to colleges are being overrun by “radical” teachers bent on destroying “our children” with “Marxist doctrines.”The president was talking about an educational framework known as critical race theory, which holds that the founding of the United States is inextricable from slavery and racism, with their impacts still reverberating today.“Critical race theory and the crusade against American history is toxic propaganda, ideological poison that, …