Based on the clue 'around 207 bc the greek stoic philosopher chrysipp...', what is the answer?

What is associated with: around 1964 the north vietnamese began to turn this famous supply route into a real road that… Based on the clue 'around 20 bc i left troy behind me cause i had to ...', what is the answer? What is associated with: around 2000 years ago members of this large african ethnolinguistic group began settling in an… What is associated with: around 2000001 bc this probable ancestor of ours whose name means handy man was using simple t… Based on the clue 'around 240 bc chinese astronomers observed this la...', what is the answer? What is associated with: around 2500 bc the harappan civilization sprung up around this river in pakistan nothwestern i… What is associated with: around 2600 bc pharaoh djoser was entombed in a step one the first large stone structure? What is associated with: around 2700 bc thuban was the north star today this is the north star?