I keep reading about the high percentage of tech startups in the US that are founded by foreign entrepreneurs (39% in California). I also keep reading about how hard immigrating to the US is for foreign entrepreneurs - i.e., people without prospective traditional employment. Can somebody explain this apparent contradiction? How is it that so many startups are founded by foreigners if it's so hard for them to stay in the country to do so?
I ask because I'm Canadian and I'd like to look into starting a software/biotech company in the US after college (I've heard about the proposed startup visa, but clearly plenty of foreign entrepreneurs are doing just fine without it).