It looks like "immigrated to" is now more popular in American English (https://books.google.com/ngrams/graph?content=immigrated+to%2Cemigrated+to&year_start=197

It looks like "immigrated to" is now more popular in American English (https://books.google.com/ngrams/graph?content=immigrated+to%2Cemigrated+to&year_start=1970&year_end=2022&corpus=en-US&smoothing=3&case_insensitive=true https://books.google.com/ngrams/graph?content=immigrated+to%...), but not in British English (https://books.google.com/ngrams/graph?content=immigrated+to%2Cemigrated+to&year_start=1970&year_end=2022&corpus=en-GB&smoothing=3&case_insensitive=true https://books.google.com/ngrams/graph?content=immigrated+to%...).