They invented things like the pulley, paper made from papyrus.
The country that faced a unity crisis due to having a large variety of ethnic groups was D.)Austria-Hungary.
<h3>Which groups were in Austria-Hungary?</h3>
Austria-Hungary was an empire that comprised of several ethnic groups including Serbs, Bosnians, Croats, Hungarians, and Austrians.
These groups wanted independence for themselves and this led to a lot of strife in the empire.
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The bill of rights,location of the capital were two off them I believe
Because it had a reputation as the most segregated city in the South
4. World population did not reach one billion until 1804.
