The policy memo issued last week requires many foreigners to obtain green cards through their home countries

A new policy memo issued last week by US Citizenship and Immigration Services (USCIS), requiring many foreigners in the US to leave the country and obtain green cards through their home countries, has sparked confusion and fear among hundreds of thousands of visa holders and families, as well as immigration advocates and lawyers.

Multiple Guardian readers, speaking anonymously out of fear, said the memo threatens to upend lives they have spent years building in the US – from careers and homes to marriages and long-term plans for stability.