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[ So, what is it ? ]
Answer – 1800s & early 1900s
Some Important Dates:
1803 after Lousiana purchase – French speaking influence sparked the first English Only movement.
1847 Anglo-French Instruction approved in Louisiana
1849 Spanish language rights granted in California
1868 – 1898 English Only schools established in many areas
1911 NCTE National Commission for Teachers of English
1924 Linguistic Society of America