What is the name of law that created need for schools to?

There isn't one single law that created the need for schools. The development of compulsory education was a gradual process spanning centuries and varying significantly by location. However, key pieces of legislation in different countries and at different times established compulsory schooling.

In the United States, for example, there's no single federal law mandating schooling. Instead, individual states enacted compulsory attendance laws, starting in Massachusetts in 1852. These laws built upon earlier efforts to establish public schools, often driven by a combination of social, economic, and religious factors.

Therefore, there's no single answer to your question. The "need" for schools arose from various societal pressures, and the legal frameworks enforcing attendance evolved over time in different jurisdictions.