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 various U.S. magazines, fall 1918]