Based on the clue 'at around 20 in each country this ethnic group is ...', what is the answer?

Based on the clue 'at antoines in new orleans try these a la rockefel...', what is the answer? What is associated with: at antwerp in 1920 the olympic flag debuted these birds were first released as symbols of peac… Based on the clue 'at any of the marie callenders top off your meal w...', what is the answer? Based on the clue 'at around 13 george learned this skill of measurin...', what is the answer? Based on the clue 'at around 20 miles long the onyx river is this con...', what is the answer? Based on the clue 'at arrival or departure this salute is fired for a...', what is the answer? Based on the clue 'at ascot if you do a heinz youve made this many be...', what is the answer? What is associated with: at bannockburn in 1314 he led a small force to take stirling castle britains last stronghold i…