i had a conversation with my husband about this very topic!
if you are an american, i can understand the gist of this question. how can certain segments of foreigners just up and move to another country in such large numbers? isn't it difficult to do, emotionally-speaking?
we, as americans, don't understand it because--unless we are immigrants ourselves--we don't move!
a new pew social & demographic trends survey finds that most americans have moved to a new community at least once in their lives, although a notable number-nearly four-in-ten-have never left the place in which they were born[color=#426983]1
that's 40% of americans have never moved from their hometowns. ever.
my in-laws came here from a western european country, and, considering they've lived in only two cities their entire lives (here and there), i told my husband, "wow, that was a big change for them to make, seeing as they didn't like change that much!"
his response: "no it wasn't. a lot of people during that time in [their home country] were coming to the us. it was no big deal, really, like it is to us."
in my opinion, if an entire culture sees emigration as a norm, it will happen often and in large numbers, often to a single country or even to one geographic area in a single country. americans moving to another country to live is not a norm, so it may seem odd to us.