Conversation so far:
What was Immanuel Kant's stance on major political ideals?
Immanuel Kant believed that universal history leads to the ultimate world of republican states at peace, but his theory was not pragmatic.
Are there any other interesting aspects about this article, besides Immanuel Kant's stance on major political ideals?
Immanuel Kant invented critical philosophy, that is of the notion of being able to discover and systematically explore possible inherent limits to our ability to know through philosophical reasoning
Were there any problems with Immanuel Kant's theory?
Immanuel Kant argued there is no way of observing the self, we can see the logical necessity of the self when we observe our different perceptions of the external environment.
Was Immanuel Kant criticized?
Immanuel Kant's former student, Johann Gottfried Herder criticized the Kant's book for placing reason as an entity worthy of criticism instead of considering the process of reasoning.
Did the public take to Immanuel Kant philosophy?
Though Immanuel Kant's views faced opposition from certain scholars, his views ultimately became widely accepted by most philosophers.
Did Immanuel Kant have any other political stances?
Immanuel Kant opposed democracy, which at his time meant direct democracy, believing that majority rule posed a threat to individual liberty.

Question: Was this challenged?
Self-contained rewrite: Was Immanuel Kant's political philosophy challenged?