Because they were just now looking in the anatomy of the human body and the first vaccines were made
The Madisonian model is a structure of government in which the powers of the government are separated into three branches: executive, legislative, and judicial.
Because Austria's army in 1788 was not one single and unified fighting force. Rather, Austria's army (Which at the time was not called Austria but the Habsburg Empire) was composed of squads from many smaller nations that were found in the Habsburg Empire. Because there were strong nationalist tendencies among these, they spoke differently and this eventually lead to big differences among different groups and attacks between each other.