However crowded the Muckety map below might appear, its message is simple.
Members of the Walton family, heirs to the Wal-Mart fortune, have devoted a significant share of their philanthropic activities to charter schools.
The interactive map shows charter schools, their networks and their advocates, receiving funds from the Walton Family Foundation, a grantmaker with assets of more than $1.5 billion.
Changing the education system is a major focus, with more than $164 million dedicated to the cause last year. The grants made up more than half of the foundation’s total giving.