Which of the following make unionizing possible?

Unions have long been part of our nation's history, fighting for better pay, safer working conditions, health care and retirement benefits, education and civic participation. ... Unions played a major role in ending the sweatshops and child labor so common at the beginning of the 20th century.

what are the others?

both believe in many god or polytheism

both built temples that they worshiped in both civilization's god were humanoid

both groups made religion a large portion of their lives

both believe in one religion throughout

the dead were buried with items for the afterlife