Why did many european intellectuals admire the american revolution and the u. s. constitution and u. s. bill of rights?

For the answer to the question above, I believe that the colonies' ideas came from the ideals of natural rights proposed during the time of Enlightenment Period.
I hope this helps. Have a nice day!

Because broadest terms allows the law flexibility depending on changing society and circumstances.

The statistics for the eastern war are grim. more than three-million men died in the fighting, more than nine-million men were wounded, and every major country which participated lost its form of government.