The double standard is funny. If the US or UK did something like this, we’d (rightly) consider it xenophobic and condemn it. But with Japan, we’re like “Yes! You must secure the existence of your people and a future for Japanese children!”

You might need to prove your knowledge of the English language if you’re 18 or over and applying for citizenship or to settle in the UK (known as ‘indefinite leave to remain’).

You can prove it by having either:

• an English qualification at B1, B2, C1 or C2 level
• a degree taught or researched in English

www.gov.uk/english-language

A. Educational Requirements

An officer administers a naturalization test to determine whether an alien meets the English and civics requirements.[1] > The naturalization test consists of two components:

• English language proficiency, which is determined by the alien’s ability to read, write, speak and understand English; and

www.uscis.gov/…/volume-12-part-e-chapter-2

They already do it…

In the US, there is no language test for a green card. There is for naturalization though.