I've finished writing a historical young adult novel set in the 1960s. I've sent out well over 100 query letters, all with form rejections, if the agents sent anything at all. I can't believe it's my query because I've had it critiqued to death and the latest round of critiques the people who looked at it thought it was great.
So, that leads me to the second part of the question posed in the Discussion Title above. Could it be the subject matter? I've been told YA novels set in the 1960s are a hard sell. Still, I've seen YA novels set in the 1950s that have done well, even winning literary awards. Is one decade all that different?