The 92% drop in legal immigration to US in 2nd half FY2020 is larger than "during any single year in American history"-Larger than start of WWI, Congress closing legal immigration from Europe in 1925, Great Depression & U.S. entering WWII:
The US hasn't experienced an immigration rate this low since World War II, and it has never seen as fast and as dramatic a cut as it's seen in the 2nd half of 2020.
second half of FY20 saw 92% fewer immigrants from abroad than the first half, which was larger than any annual decline in history of US. (This refers to people applying for green cards while outside of the country, a subset of total immigration)