How the term Evangelical has grown to blur theology and ideology

In the 19th century several lay preachers who taught a non-trinitairan Biblical faith, used printed media to spread the Good News of the coming Kingdom of God, by means of tracts and pamphlets, in times that evangelicalism became deeply intertwined with a certain strain of conservative politics, to end up in the 21st century where conservative evangelists became fundamentalists totally taken by GOP politics and blurring the lines between theology and ideology.