Migration was the major engine of globalization during the late nineteenth and early twentieth centuries,and at present it is important again.
About 3 percent of the world's population(over 200 million people) has nugrated to another country.
Because this 3 percent is spread unevenly,the percentagentage is much greater in some countries that in others; in Hong Kong and Singapore, it represents over 40 percent, and in brazil and Mexico less than 1 percent of the population.