China had the most developed economic system and was culturally the most developed country. Its religion was also widely accepted and all surrounding countries looked up to China because of these cultural and religious achievements. For example, most of the area adopted their writing to their own language because they didn't have their own system of writing.
Greek were very connected to the sea. They took advantage of living by the sea. They were fishermen, sailors, traders and more.
Generally speaking, from the 1830s on, people hoping to settle in the Northwest "B-traveled along the Oregon Trail," since this had become a well-established route.