Which scientist first described how blood circulated in the human body? ambroise paré rené descartes william harvey

What was america's response to the holocaust before the war? what could the us have done differently?

Did the spanish settlers and missions have a positive effect on world history? why, what did they do that was positive? why was the treaty of paris (1763) good for the world/world history? did the plymouth colony have a positive effect on world history? why, what did they do that was positive?

What was the underlying cause of the cold war?