Others were refugees from wars, or migrated illegally.
Growth migrated from corporate markets to consumers and from rich countries to emerging markets, where people are warier of shopping online.
So institutional investors, particularly, migrated to various forms of "dark" trading, which help to conceal the volumes they are buying and selling and the prices at which they are willing to deal.
They migrated to Hong Kong in the 1950s after the communist takeover, when getting out was hard and shifting wealth even harder.
Third, economic value, having migrated from goods to services, will now increasingly move to data and the algorithms used to analyse them.
But millions of South Asians, many of them Muslims, migrated as well, especially to Burma, then administered by Britain as part of its Indian empire.
His clan migrated to Pakistan from Central Asia with the Mughal emperors.
The audience for network television has been declining relentlessly as viewers have migrated to cable and the internet.
As more people migrated to the cities, its vote swelled.
He explained that enterprising pickpockets from Sydney's rival city migrated north for a day of rich pickings among the million Sydneysiders who thronged the streets for the biggest public event in their city's history.Sylvia Scott, an aboriginal woman, gave our throng a formal welcome, reminding us that her people were officially non-citizens in 1932.
Hangzhou, the watery city further south to which the dynasty migrated when Kaifeng was sacked by Jurchen nomads from the north in the 1120s, was even richer and bigger: over 1m merchants, artisans, officials, scholars, servants and slaves.
