米国移民： 1470万人（25歳以上）が高学歴 – Pew Research Center（海外各紙）：
4 ways highly educated immigrants study and work in U.S.：
4种受过高等教育的移民在美国学习和工作的方式
米国には、2015年時点で、大学学位を持つ25歳以上の移民が、1470万人居ます。
カナダの3倍（440万人）
イギリスの4倍（340万）
各種VISAの発給状況は次の通りです。
Pew Research Center
H-1B visas
F-1 visas
Optional Practical Training
Green cards
Many college-educated immigrants also live and work in the U.S. through green cards, which provide lawful permanent residence to around a million foreign-born people each year based on a complex system of admission categories and quotas. It’s important to note that green cards are not specific to college-educated foreigners: They are available to immigrants regardless of their educational background.
Pew Research Center