American men don't cry. Only Sissies cry. Crying is a "weakness" characteristic of the female, and no American male wants to be identified with anything in the least weak or feminine. No one likes a crybaby, and crying is disapproved even in children. In a land so devoted to the pursuit of happiness, crying is rather un-American.

(from Ashley Montague : The Oxford Guide to Writing : A Rhetoric Handbook for College Students)

Question: Which is the topic sentence in this paragraph?