After facing months of protest, conservative members of the Texas Board of Education were expected Thursday night to vote to teach schoolchildren a version of American history that emphasizes the roles of capitalist enterprise, the military, Christianity and modern Republican political figures.

The scheduled vote was a preliminary tally, with the final vote by the same group planned for Friday.

The decision, expected to fall largely along the party lines — the board has 10 Republicans and 5 Democrats — followed tens of thousands of public comments, a protest rally and a daylong hearing where about 200 speakers addressed the board.

By sheer force of its population size, Texas has long held outsize influence on national textbook publishers, some of whom sent curriculum writers to take notes in the boardroom.

That influence has waned somewhat in recent years, with the digital age allowing editors to tailor versions of their textbooks to individual states.

But Texas has only increased in stature as a symbolic battleground over the politicization of education, largely because of the emergence of a conservative voting bloc on the board....