Many professional associations offer special low cost membership to students, as well as opportunities for students to present before their peers and mingle with some of the best in the field.
American Historical Association The granddaddy of them all and sponsor of the American Historical Review
Organization of American Historians. A good organization for those interested in teaching as well as scholarship, sponsor of the Journal of American History
World History Association. Conferences and publications focus on teaching world history. This organization is especially welcoming to students and community college instructors
Community College Humanities Association Most of the world outside Colorado considers history a humanities and not a social science. This organization sponsors stipends for trips abroad, seminars on historical subjects and conferences where students are welcome.