Based on the clue 'by the 400s bc the greeks had perfected 3 orders o...', what is the answer?

Based on the clue 'by the 15th century knights just werent that impor...', what is the answer? What is associated with: by the 1871 treaty of frankfurt france gave germany alsace part of this quiche making province? What is associated with: by the 1920s balenciaga was the leading couturier in this country his homeland? What is associated with: by the 1950s scientists were able to do this to frogs mice followed in the 80s? Based on the clue 'by the 4th century ad rome had 28 public ones stac...', what is the answer? Based on the clue 'by the 6th century this group had joined with the ...', what is the answer? Based on the clue 'by the 7th century this civilzations city of tikal...', what is the answer? Based on the clue 'by the age of 10 this 21 young man had already vis...', what is the answer?