It was the "nativists" who believed that only long-ago immigrants from Western Europe could become real Americans, since they believed these immigrants were "natives" to the land.
A) reconstructing American society
The Social Gospel movement took place during the Gilded Age and sought to reform society to be more moral and proper.
The Social Gospel movement supported reform especially for social groups that were struggling in society. The aimed to reform prisons, orphanages, education, and laws regarding morality. Early reformers wanted to make alcohol illegal and encourage chaste behaviors. They also worked to improve working conditions and get rid of child labor.