Wal-Mart truck

The state charter school association has received a $15-million grant from the Walton family, the founders of the Wal-Mart Corp, to add 20,000 more charter school students in Los Angeles and 100,000 statewide. (Seth Perlman / AP Photo / May 16, 2011)

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The state charter school association has received a $15-million grant from the Walton Family Foundation to add 20,000 more charter school students in Los Angeles and 100,000 statewide.

The grant, scheduled to be announced Tuesday, is the largest by far to the California Charter Schools Assn., and also the largest of its kind from the nonprofit established by the founders of the Wal-Mart Corp.

The Los Angeles Unified School District has more charter schools — 183 last year — and more charter-school students than any school system in the country, and that growth spurt is poised to continue despite countervailing pressure from