AUSTIN, Tex. — Even as a panel of educators laid out a vision Wednesday for national standards for public schools, the Texas school board was going in a different direction, holding hearings on changes to its social studies curriculum that would portray conservatives in a more positive light, emphasize the role of Christianity in American history and include Republican political philosophies in textbooks.

The hearings are the latest round in a long-running cultural battle on the 15-member State Board of Education, a battle that could have profound consequences for the rest of the country, since Texas is one of the largest buyers of textbooks.

The board is expected to take a preliminary vote this week on a raft of changes to the state’s social studies curriculum proposed by the seven conservative Republicans on the board. A final vote will come in May.

Conservatives argue that the proposed curriculum, written by a panel of teachers, emphasizes the accomplishments of liberal politicians — like the New Deal and the Great Society — and gives less importance to efforts by conservatives like President Ronald Reagan to limit the size of government.