home front (n.)
also homefront, 1918, from home (n.) + front (n.) in the military sense. A term from World War I; popularized (if not coined) by the agencies running the U.S. propaganda effort.
The battle front in Europe is not the only American front. There is a home front, and our people at home should be as patriotic as our men in uniform in foreign lands. [promotion for the Fourth Liberty Loan appearing in U.S. magazines, fall 1918]